Portable monitoring devices for processing applications and processing analysis of physiological conditions of a user associated with the portable monitoring device

ABSTRACT

An activity monitoring device, methods and computer readable media are provided. The activity monitoring device includes a housing configured for attachment to a body part of a user and a display screen attached to the housing. Further included is a first sensor disposed in the housing for capturing motion of the activity monitoring device when attached to the body part of the user and a second sensor disposed in the housing for sampling a heart rate of the user. Memory is disposed in the housing for storing the motion captured by the first sensor and the heart rate sampled by the second sensor. A processor is disposed in the housing and is configured to determine a physical state of the user during a period of time. For motion that is below a threshold the processor identifies the physical state to be a sedentary state and for motion that is at or above the threshold the processor identifies the physical state to be an active state. The processor is configured to reduce a rate at which to sample the heart rate of the user when the physical state of the user is identified to be the sedentary state during the period of time. The processor is configured to increase the rate at which the sampling of the heart rate of the user is processed when the physical state of the user is identified to be the active state during the period of time.

CLAIM OF PRIORITY

This application is a continuation claiming priority of pending U.S.patent application Ser. No. 14/221,234, filed on Mar. 20, 2014, andentitled “Portable Monitoring Devices for Processing Applications andProcessing Analysis of Physiological Conditions of a User AssociatedWith the Portable Monitoring Device,” which is a continuation of U.S.patent application Ser. No. 14/156,413 (now issued as U.S. Pat. No.9,241,635, issued on Jan. 26, 2016), filed on Jan. 15, 2014, andentitled “Portable Monitoring Devices for Processing Applications andProcessing Analysis of Physiological Conditions of a User AssociatedWith the Portable Monitoring Device,” all of which are incorporatedherein by reference.

U.S. patent application Ser. No. 14/156,413, filed on Jan. 15, 2014claims priority from U.S. Provisional Application No. 61/752,826, filedon Jan. 15, 2013, and entitled “Portable Monitoring Devices and Methodsof Operating Same,” all of which are herein incorporated by reference.

U.S. patent application Ser. No. 14/156,413, filed on Jan. 15, 2014claimed priority to U.S. Provisional Application No. 61/885,966, filedon Oct. 2, 2013 and entitled “Methods, Systems and Devices forGenerating Real-Time Activity Data Updates to Display Devices,” which isherein incorporated by reference.

U.S. patent application Ser. No. 14/156,413, filed on Jan. 15, 2014 is acontinuation-in-part of U.S. patent application Ser. No. 13/959,714,filed on Aug. 5, 2013, (now issued as U.S. Pat. No. 8,762,101, issued onJun. 24, 2014) titled “Methods and Systems for Identification of EventData Having Combined Activity and Location Information of PortableMonitoring Devices,” all of which are incorporated herein by reference.

U.S. patent application Ser. No. 13/959,714, filed on Aug. 5, 2013, is acontinuation-in-part of U.S. patent application Ser. No. 13/693,334 (nowissued as U.S. Pat. No. 8,548,770, issued on Oct. 1, 2013), filed onDec. 4, 2012, titled “Portable Monitoring Devices and Methods forOperating Same”, which is a divisional of U.S. patent application Ser.No. 13/667,229 (now issued as U.S. Pat. No. 8,437,980, issued on May 7,2013), filed on Nov. 2, 2012, titled “Portable Monitoring Devices andMethods for Operating Same”, which is a divisional of U.S. patentapplication Ser. No. 13/469,027, (now issued as U.S. Pat. No. 8,311,769,issued on Nov. 13, 2012), filed on May 10, 2012), titled “PortableMonitoring Devices and Methods for Operating Same”, which is adivisional of U.S. patent application Ser. No. 13/246,843, (now issuedas U.S. Pat. No. 8,180,591, issued on May 15, 2012), filed on Sep. 27,2011, which is a divisional of U.S. patent application Ser. No.13/156,304 (now issued as U.S. Pat. No. 9,167,991, issued on Oct. 27,2015), filed on Jun. 8, 2011, titled “Portable Monitoring Devices andMethods for Operating Same”, which claims the benefit of and priorityto, under 35 U.S.C. 119§ (e), to U.S. Provisional Patent Application No.61/388,595, filed on Sep. 30, 2010, and titled “Portable MonitoringDevices and Methods for Operating Same”, and to U.S. Provisional PatentApplication No. 61/390,811, filed on Oct. 7, 2010, and titled “PortableMonitoring Devices and Methods for Operating Same”, all of which arehereby incorporated by reference in their entirety.

U.S. patent application Ser. No. 13/959,714, filed on Aug. 5, 2013 is acontinuation-in-part of U.S. patent application Ser. No. 13/759,485 (nowissued as U.S. Pat. No. 8,543,351, issued on Sep. 24, 2013), filed onFeb. 5, 2013, titled “Portable Monitoring Devices and Methods forOperating Same”, which is a divisional of U.S. patent application Ser.No. 13/667,229 (now issued as U.S. Pat. No. 8,437,980, issued on May 7,2013), filed on Nov. 2, 2012, titled “Portable Monitoring Devices andMethods for Operating Same”, which is a divisional of U.S. patentapplication Ser. No. 13/469,027, (now issued as U.S. Pat. No. 8,311,769,issued on Nov. 13, 2012), filed on May 10, 2012), filed on May 10, 2012,titled “Portable Monitoring Devices and Methods for Operating Same”,which is a divisional of U.S. patent application Ser. No. 13/246,843,(now issued as U.S. Pat. No. 8,180,591, issued on May 15, 2012), filedon Sep. 27, 2011, which is a divisional of U.S. patent application Ser.No. 13/156,304, (now issued as U.S. Pat. No. 9,167,991, issued on Oct.27, 2015), filed on Jun. 8, 2011, titled “Portable Monitoring Devicesand Methods for Operating Same”, which claims the benefit of andpriority to, under 35 U.S.C. 119§ (e), to U.S. Provisional PatentApplication No. 61/388,595, filed on Sep. 30, 2010, and titled “PortableMonitoring Devices and Methods for Operating Same” and to U.S.Provisional Patent Application No. 61/390,811, filed on Oct. 7, 2010,and titled “Portable Monitoring Devices and Methods for Operating Same”,all of which are hereby incorporated by reference in their entirety.

U.S. patent application Ser. No. 14/156,413 filed on Aug. 5, 2013 is acontinuation of U.S. patent application Ser. No. 13/959,719 (now U.S.Pat. No. 8,712,724, issued on Apr. 29, 2014), filed on Aug. 5, 2013,titled “Calendar Integration Methods and Systems for Presentation ofEvents Having Combined Activity and Location Information”, which isincorporated by reference herein in its entirety.

FIELD

The present disclosure relates to systems and methods for linkingcommunication between an activity tracking device and a client device.

BACKGROUND

In recent years, the need for health and fitness has grown tremendously.The growth has occurred due to a better understanding of the benefits ofgood fitness to overall health and wellness. Unfortunately, althoughtoday's modern culture has brought about many new technologies, such asthe Internet, connected devices and computers, people have become lessactive. Additionally, many office jobs require people to sit in front ofcomputer screens for long periods of time, which further reduces aperson's activity levels. Furthermore, much of today's entertainmentoptions involve viewing multimedia content, computer social networking,and other types of computer involved interfacing. Although such computeractivity can be very productive as well as entertaining, such activitytends to reduce a person's overall physical activity.

To provide users concerned with health and fitness a way of measuring oraccounting for their activity or lack thereof, fitness trackers areoften used. Fitness trackers are used to measure activity, such aswalking, motion, running, sleeping, being inactive, bicycling,exercising on an elliptical trainer, and the like. Usually, the datacollected by such fitness trackers can be transferred and viewed on acomputing device. However, such data is often provided as a basicaccumulation of activity data with complicated or confusing interfaces.In addition, updates between a tracker and a client device usuallyrequire wired connectors and/or complex syncing schemes.

It is in this context that embodiments described herein arise.

SUMMARY

Embodiments described in the present disclosure provide systems,apparatus, computer readable media, and methods.

In one embodiment, an activity monitoring device is disclosed. Theactivity monitoring device includes a housing configured for attachmentto a body part of a user and a display screen attached to the housing.Further included is a first sensor disposed in the housing for capturingmotion of the activity monitoring device when attached to the body partof the user and a second sensor disposed in the housing for sampling aheart rate of the user. Memory is disposed in the housing for storingthe motion captured by the first sensor and the heart rate sampled bythe second sensor. A processor is disposed in the housing and isconfigured to determine a physical state of the user during a period oftime. For motion that is below a threshold the processor identifies thephysical state to be a sedentary state and for motion that is at orabove the threshold the processor identifies the physical state to be anactive state. The processor is configured to reduce a rate at which tosample the heart rate of the user when the physical state of the user isidentified to be the sedentary state during the period of time. Theprocessor is configured to increase the rate at which the sampling ofthe heart rate of the user is processed when the physical state of theuser is identified to be the active state during the period of time.

In one embodiment, an activity monitoring device and associated methodsfor using and interfacing with the activity monitoring device areprovided. In one example, the activity monitoring device includes ahousing configured for attachment to a body part of a user. Alsoincluded ins a display screen attached to the housing and a sensor forcapturing physiological conditions of the user. The sensor is disposedalong a surface of the housing so that the sensor is proximate to thebody part, the body part having at least some exposed skin. The activitymonitoring device also includes memory for storing the capturedphysiological conditions, and a processor for examining the capturedphysiological conditions. At a particular time, the processorautomatically selects an application to execute from a plurality ofapplications based on characteristics of the captured physiologicalconditions.

In another embodiment, an activity monitoring device is provided. Thedevice includes a wrist band and a display screen disposed on a housing.The wrist band is coupled to the housing. A sensor is disposed in thehousing to capture data associated with a user. Memory is disposed inthe housing for storing the captured data and for storing one or moreapplications. Further provided is a processor that is in communicationwith the housing and the display screen. The processor is configured toexecute the one or more applications to render content associated withthe one or more applications on the display screen, at least one of theapplications being configured to present metric regarding the captureddata of the sensor. The captured data including one of motion data bythe user, environmental data, biometric data of the user, orcombinations of two or more thereof, and the processor enables a user toaccess the one or more applications to cause rendering of a userinterface on the display screen.

BRIEF DESCRIPTION OF THE DRAWINGS

Various embodiments described in the present disclosure may best beunderstood by reference to the following description taken inconjunction with the accompanying drawings.

FIG. 1 illustrates an exemplary portable monitoring device which enablesuser interaction via a user interface, wherein the portable monitoringdevice may have a user interface, processor, biometric sensor(s),memory, environmental sensor(s) and/or a wireless transceiver which maycommunicate with an external device (for example, a client and/orserver);

FIG. 2 illustrates an exemplary portable biometric monitoring devicewhich may be secured to the user through the use of a band; theexemplary portable biometric monitoring device may have a display,button(s), electronics package, and/or a band or an attachment band;notably, the band or attachment band is employed to secure the portablebiometric monitoring device to the user, for example, an appendage ofthe user, for example, via hooks and loops (e.g., Velcro), a clasp,and/or a band having memory of its shape (e.g. through the use of, forexample, a spring metal band, elastic band, a “rubber” band, and/or awatch-like band);

FIG. 3 illustrates a view of the skin facing portion of the portablebiometric monitoring device of, for example, FIG. 2; notably, in thisembodiment, the portable monitoring device includes a sensor protrusionand recess for mating a charger and/or data transmission cable; notable,the protrusion may more firmly maintain the sensor in contact with theskin of the user (for example, predetermined or fixed relational contactwith the skin of the user);

FIG. 4 illustrates a cross-sectional view (through the electronicspackage) of an exemplary portable biometric monitoring device;

FIG. 5 illustrates a cross sectional view of a sensor protrusion of anexemplary portable biometric monitoring device; notably, two lightsources (e.g. LED's) may be located on one or more sides of thephotodetector (for example, either side or opposing sides of aphotodetector) to enable photoplethysmography (PPG) sensing whereinlight blocking material may be placed between the light sources and thephotodetector to prevent any light from the light sources from goingthrough the device body and being detected by the photodetector (in oneembodiment, the light sources and photodetector are placed on a flexiblePCB); a flexible transparent layer may be placed on the lower surface ofthe sensor protrusion to form a seal wherein the transparent layer mayprovide other functions such as preventing liquid from entering thedevice where the light sources or photodetectors are disposed or placed;notably, the transparent layer may be formed through in-mold labeling or“IML”;

FIG. 6 illustrates a cross sectional view of a sensor protrusion of anexemplary portable biometric monitoring device; notably, the protrusionis similar to that illustrated in the exemplary portable biometricmonitoring device of FIG. 5; however, the light sources andphotodetector are placed on a flat and/or rigid PCB;

FIG. 7 illustrates another cross-sectional view of a PPG sensor, whereinin this embodiment, the PPG sensor does not include a protrusion;moreover, a gasket and/or a pressure sensitive adhesive may be employedto resist, inhibit and/or prevent liquid from entering the body of thedevice;

FIG. 8 illustrates an exemplary geometry of a PPG light source andphotodetector wherein, in this embodiment, two light sources are placedon either side of a photodetector; notably, the lights sources andphotodetector may be disposed or located in a protrusion on the back ofa portable biometric monitoring device which may also operate as a smartwatch (the side which faces the skin of the user);

FIG. 9 illustrates an exemplary PPG sensor having a photodetector andtwo LED light sources which may be disposed or located in a portablebiometric monitoring device having a protrusion; notably, in thisembodiment, light pipes are optically connected the LED's andphotodetector to the surface of the user's skin, wherein, in operation,the light from the light sources scatters/reflects off of blood in thebody, some of which reaches the photodetector via the light pipes;notably, the light pipes preferentially direct or transmit light along apredetermined path, for example, defined by the geometry and/or materialof the light pipe;

FIG. 10 illustrates an exemplary PPG detector having a protrusion withcurved sides to reduce and/or minimize any discomfort to the user duringoperation and/or to more firmly maintain the sensor in contact with theskin of the user (for example, predetermined or fixed relational contactwith the skin of the user); in this embodiment, the surface of lightpipes are connect the photodetector and LEDs to the user's skin and arecontoured to enhance and/or maximize light flux coupling between theLEDs and photodetectors to the light pipes; notably, the end of thelight pipes which face the user's skin may also contoured wherein thiscontour may provide focusing or defocusing to enhance and/or optimizethe PPG signal (for example, the contour may focus light to a certaindepth and location which coincides with an area where blood flow islikely to occur); in addition, the vertex of these foci overlap or arevery close together so that the photodetector may receive, for example,the maximum possible amount of scattered/reflected light;

FIG. 11 illustrates an exemplary portable biometric monitoring devicehaving a band and optical sensors and light emitters disposed therein;

FIG. 12 illustrates a portable biometric monitoring device having adisplay and wristband; an optical PPG (e.g. heart rate) detectionsensors and/or emitters may be disposed or located on the side of thedevice; notably, in one embodiment, the sensors and/or emitters aredisposed or located in buttons mounted on the side of the device;

FIG. 13 illustrates a user who is inputting a user input by pressing theside of a portable biometric monitoring device wherein, in response, thedevice takes a heart rate measurement from a side mounted optical heartrate detection sensor; a display of the device may thereafter displaywhether or not the heart rate has been detected and/or display theuser's heart rate;

FIG. 14 illustrates functionality of a portable biometric monitoringdevice smart alarm feature wherein, in this embodiment, the monitoringdevice may be able to detect or may be in communication with a devicewhich can detect the sleep stage or state of a user (e.g. light or deepsleep); the user may set a window of time which they would like to beawoken (e.g. 6:15 am to 6:45 am); the smart alarm may be triggered bythe user going into a light sleep state during the alarm window;

FIG. 15 illustrates, in a flow diagram form, the operation of a portablebiometric monitoring device which changes how the device detects auser's heart rate based on how much movement the device is experiencing;in this embodiment, there is motion detected (e.g. through the use of anaccelerometer), the user may be considered active and high sampling rateheart rate detection may occur to reduce motion artifacts in the heartrate measurement; the data may be saved and/or displayed; notably, wherethe user is not moving, low sampling heart rate detection (which doesnot consume as much power) may be adequate to measure a heart rate;

FIG. 16 illustrates an exemplary portable monitoring device which has abicycle application (resident thereon) which may display speed and/orcadence among other metrics; the application may be activated wheneverthe monitoring device comes into proximity of a passive or active NFCtag, which may be attached to or disposed on the bicycle, for example,the bicycle handlebar(s), frame and/or pedal(s);

FIG. 17 illustrates an exemplary PPG sensor having a light source, lightdetector, ADC, processor, DAC/GPIOs, and light source intensity andon/off control;

FIG. 18 illustrates an exemplary PPG sensor which is similar to theembodiment illustrated in FIG. 17; in this embodiment, however, thesensor employs a sample and hold circuit as well as analog signalconditioning;

FIG. 19 illustrates an exemplary PPG sensor which is similar to theembodiment illustrated in FIG. 17; in this embodiment, however, thesensor employs a sample and hold circuit (and, in one embodiment,oversamples the signals);

FIG. 20 illustrates an exemplary PPG sensor having multiple switchablelight sources and detectors, light source intensity and on/off control,and signal conditioning circuitry

FIG. 21 illustrates an exemplary PPG sensor which uses synchronousdetection; notably, in this embodiment, a demodulator is employed todetect/recover the signal;

FIG. 22 illustrates an exemplary PPG sensor which is similar to theembodiment illustrated in FIG. 17; in this embodiment, however, thesensor employs a differential amplifier in the signal detection path;

FIG. 23 illustrates an exemplary PPG sensor having many of thefeatures/circuitry illustrated in FIG. 17-22;

FIG. 24 illustrates certain circuitry/elements of an exemplary portablebiometric monitoring device having a heart rate or PPG sensor, motionsensor, display, vibromotor/vibramotor, and communication circuitrywhich are connected to a processor;

FIG. 25 illustrates certain circuitry/elements of an exemplary portablebiometric monitoring device having a heart rate or PPG sensor, motionsensor, display, vibromotor/vibramotor, location sensor, altitudesensor, skin conductance/wet sensor and communication circuitry which isconnected to a processor;

FIG. 26 illustrates certain circuitry/elements of an exemplary portablemonitoring device having physiological sensors, environmental sensors,and/or location sensors connected to a processor;

FIG. 27 illustrates, in block diagram form, exemplary signal flow ofmotion signals and optical PPG signals which are employed to measure aheart rate of the user;

FIG. 28 illustrates, in block diagram form, exemplary signal flow ofmotion signals and optical PPG signals which are employed to measure aheart rate of the user;

FIG. 29 illustrates a sensor which has an analog connection to a sensorprocessor which, in turn, has a digital connection to an applicationprocessor;

FIG. 30 illustrates a sensor device which has one or multiple sensorsconnected to an application processor; and

FIG. 31 illustrates a sensor device which has one or multiple sensorsconnected to sensor processors which, in turn, are connected to anapplication processor.

Again, there are many inventions described and illustrated herein. Thepresent inventions are neither limited to any single aspect norembodiment thereof, nor to any combinations and/or permutations of suchaspects and/or embodiments. Each of the aspects of the presentinventions, and/or embodiments thereof, may be employed alone or incombination with one or more of the other aspects of the presentinventions and/or embodiments thereof. For the sake of brevity, many ofthose combinations and permutations are not discussed separately herein.

Moreover, many other aspects, inventions and embodiments, which may bedifferent from and/or similar to, the aspects, inventions andembodiments illustrated in the drawings, will be apparent from thedescription, illustrations and claims, which follow. In addition,although various features and attributes have been illustrated in thedrawings and/or are apparent in light thereof, it should be understoodthat such features and attributes, and advantages thereof, are notrequired whether in one, some or all of the embodiments of the presentinventions and, indeed, need not be present in any of the embodiments ofthe present inventions.

DETAILED DESCRIPTION

The present inventions relate to a biometric monitoring device andmethods and techniques to collect one or more types of physiological andenvironmental data from embedded sensors and/or external devices andcommunicates or relays such information to other devices or otherinternet-viewable sources. For example, such devices are shown inFIG. 1. While the user is wearing or manipulating the biometricmonitoring device, through one or a plurality of sensors, the device maydetect one or many of physiological metrics including, but not limitedto, the user's heart rate.

The device may have a user interface directly on the device thatindicates the state of one or more of the data types available and/orbeing tracked. The user interface may also be used to display data fromother devices or Internet sources.

The device may implement wireless communications so that when the userand device comes within range of a wireless base station or accesspoint, the stored data automatically uploads to an internet viewablesource such as a website.

In one embodiment, the device can be a computer that executes anactivity tracking application (APP). The computing device can take onany form, so long as it can process information, load and execute anapplication, and can communicate wirelessly with the activity trackingdevice. For example purposes, the device can also be or work inconjunction with a computer, a tablet computer, a smart phone, a tablet,a laptop, a desktop, a watch computer, glasses computer, or any devicehaving access to memory and processing power.

In one embodiment, the device is configured collect motion data,activity data, and other data, such as altitude or relative altitudedata, barometric pressure data, heart rate data, temperature data, alarmdata, goal data, history status data, processed data, raw data, etc.

Additionally, although the computing device may usually have access toan Internet connection, every transfer between the activity trackingdevice and the computing device does not require Internet connection.When the computing device is connected to the Internet, the computingdevice can then sync data to a server. The server, in one embodiment,can be one or more distributed servers, data centers, virtualizedservers in distributed data centers, etc. The server, in one embodiment,executes an activity management application that enables user accountaccess to metrics associated with activity tracking devices.

It should be noted that there are many inventions described andillustrated herein. The inventions are neither limited to any singleaspect nor embodiment thereof, nor to any combinations and/orpermutations of such aspects and/or embodiments. Moreover, each of theaspects of the present inventions, and/or embodiments thereof, may beemployed alone or in combination with one or more of the other aspectsof the present inventions and/or embodiments thereof. For the sake ofbrevity, many of those permutations and combinations will not bediscussed separately herein.

Further, in the course of describing and illustrating the presentinventions, various circuitry, architectures, structures, components,functions and/or elements, as well as combinations and/or permutationsthereof, are set forth. It should be understood that circuitry,architectures, structures, components, functions and/or elements otherthan those specifically described and illustrated, are contemplated andare within the scope of the present inventions, as well as combinationsand/or permutations thereof.

Physiological Sensors

The biometric monitoring device of the present inventions may use one,some or all of the following sensors to acquire physiological data,including the physiological data outlined in the table below. Allcombinations and permutations of physiological sensors and/orphysiological data are intended to fall within the scope of the presentinventions. The biometric monitoring device of the present inventionsmay include but is not limited to the types one, some or all of sensorsspecified below to acquire the corresponding physiological data; indeed,other type(s) of sensors may be employed to acquire the correspondingphysiological data, which are intended to fall within the scope of thepresent inventions. Additionally, the device may derive thephysiological data from the corresponding sensor output data, but is notlimited to the number or types of physiological data that it couldderive from said sensor.

TABLE Physiological Sensors Physiological data acquired OpticalReflectometer Heart Rate, Heart Rate Variability Potential embodiments:SpO2 (Saturation of Peripheral Oxygen) Light emitter and receiverRespiration Multi or single LED and photo diode Stress arrangement Bloodpressure Wavelength tuned for specific physiological Arterial Stiffnesssignals Blood glucose levels Synchronous detection/amplitude modulationBlood volume Heart rate recovery Cardiac health Motion Detector Activitylevel detection Potential embodiments: Sitting/standing detectionInertial, Gyro or Accelerometer Fall detection GPS Skin Temp Stress EMGMuscle tension EKG Heart Rate, Heart Rate Variability, Heart RatePotential Embodiments: Recovery 1 lead Stress 2 lead Cardiac healthMagnetometer Activity level based on rotation Laser Doppler Power MeterUltra Sound Blood flow Audio Heart Rate, Heart Rate Variability, HeartRate Recovery Laugh detection Respiration Respiration type- snoring,breathing, breathing problems User's voice Strain gauge Heart Rate,Heart Rate Variability Potential embodiment: Stress In a wrist band Wetsensor Stress Potential embodiment: Swimming detection galvanic skinresponse Shower detection

In one exemplary embodiment, the biometric monitoring device includes anoptical sensor to detect, sense, sample and/or generate data that may beused to determine information representative of, for example, stress (orlevel thereof), blood pressure and/or heart rate of a user. (See, forexample, FIGS. 2-7 and 17-23).

In this embodiment, the biometric monitoring device includes an opticalsensor having one or more light sources (LED, laser, etc.) to emit oroutput light into the user's body and/or light detectors (photodiodes,phototransistors, etc.) to sample, measure and/or detect a response orreflection and provide data used to determine data which isrepresentative of stress (or level thereof), blood pressure and/or heartrate of a user (e.g., using photoplethysmography).

In one exemplary embodiment, a user's heart rate measurement may betriggered by criteria determined by one or more sensors (or processingcircuitry connected to them). For instance, when data from the motionsensor(s) indicates a period of stillness or little motion, thebiometric monitoring device may trigger, acquire and/or obtain a heartrate measurement or data. (See, for example, FIGS. 15, 24 and 25). Inone embodiment, when the motion sensor(s) indicate user activity ormotion (for example, motion that is not suitable or optimum to trigger,acquire and/or obtain desired heart rate measurement or data (forexample, data used to determine a user's resting heart rate), thebiometric monitoring device and/or the sensor(s) employed to acquireand/or obtain desired heart rate measurement or data may be placed orremain in a low power state. (Note that measurements taken during motionmay be less reliable and may be corrupted by motion artifact.)

In another embodiment, the biometric monitoring device of the presentinventions may employ data indicative of user activity or motion (forexample, from one or more motion sensors) adjust or modifycharacteristics of triggering, acquiring and/or obtaining desired heartrate measurement or data (for example, to improve robustness to motionartifact). For instance, data indicative of user activity or motion mayadjust or modify the sampling rate and/or resolution mode of sensorswhich acquire heart rate data (for example, where the amount of usermotion exceeds a certain threshold, the biometric monitoring device mayincrease the sampling rate and/or increase the sampling resolution modeof sensors employed to acquire heart rate measurement or data. Moreover,the biometric monitoring device may adjust or modify the sampling rateand/or resolution mode of the motion sensor(s) during such periods ofuser activity or motion (for example, periods where the amount of usermotion exceeds a certain threshold). In this way, when the biometricmonitoring device determines or detects such user activity or motion,the motion sensor(s) may be placed into a higher sampling rate and/orhigher sampling resolution mode to, for example, enable more accurateadaptive filtering on the heart rate signal. (See, for example, FIG.15).

Notably, where the biometric monitoring device employs opticaltechniques to acquire heart rate measurements or data (e.g.,photoplethysmography), a motion signal may be employed to determine orestablish a particular approach or technique to data acquisition ormeasurement (e.g., synchronous detection rather than a non-amplitudemodulated approach) and/or analysis thereof. (See, for example, FIG.21). In this way, the data which is indicative of the amount of usermotion or activity establishes or adjusts the type or technique of dataacquisition or measurement by the optical heart rate data acquisitionsensors.

For example, in one preferred embodiment, the biometric monitoringdevice and technique of the present inventions may adjust and/or reducethe sampling rate of optical heart rate sampling when the motiondetector circuitry detects or determines that the user's motion is belowa threshold (for example, the biometric monitoring device determines theuser is sedentary or asleep). (See, for example, FIG. 15). In this way,the biometric monitoring device may control its power consumption (forexample, reduce power consumption by reducing the sampling rate—forinstance, the biometric monitoring device may sample the heart rate (viathe heart rate sensor) once every 10 minutes, or 10 seconds out of every1 minute. Notably, the biometric monitoring device may, in additionthereto or in lieu thereof, control power consumption via controllingdata processing circuitry analysis and/or data analysis techniques inaccordance with motion detection. As such, the motion of the user mayimpact the heart rate data acquisition parameters and/or data analysisor processing thereof.

In yet another embodiment, the biometric monitoring device may employthe sensors to calculate heart rate variability when the devicedetermines the user to be sedentary or asleep. Here, the device mayoperate the sensors in a higher-rate sampling mode (relative tonon-sedentary periods or periods of user activity that exceed apredetermined threshold) to calculate heart rate variability. Thebiometric monitoring device (or external device) may employ heart ratevariability as an indicator of cardiac health or stress.

Indeed, in a preferred embodiment, the biometric monitoring devicemeasures and/or determines the user's stress level and/or cardiac healthwhen the user is sedentary and/or asleep (for example, as detectedand/or determined by the biometric monitoring device). The biometricmonitoring device of the present inventions may determine the user'sstress level, health state (e.g., risk, onset, or progression of feveror cold) and/or cardiac health using sensor data which is indicative ofthe heart rate variability, galvanic skin response, skin temperature,body temperature and/or heart rate. In this way, processing circuitry ofthe biometric monitoring device may determine and/or track the user's“baseline” stress levels over time and/or cardiac “health” over time. Inanother embodiment, the device measures a physiologic parameter of theuser during one or more periods where the user is motionless (or theuser's motion is below a predetermined threshold), sitting, lying down,asleep, or in a particular sleep stage (e.g., deep sleep). Such data mayalso be employed as a “baseline” for stress-related parameters,health-related parameters (e.g., risk or onset of fever or cold),cardiac health, heart rate variability, galvanic skin response, skintemperature, body temperature and/or heart rate.

Notably, in one embodiment, the biometric monitoring device mayautomatically detect or determine when the user is attempting to go tosleep, entering sleep, is asleep and/or is awoken from a period ofsleep. In this embodiment, the biometric monitoring device may employphysiological sensors to acquire data wherein the data processingcircuitry correlates a combination of heart rate, heart ratevariability, respiration rate, galvanic skin response, motion, and/orskin and/or body temperature sensing to detect or determine if the useris attempting to go to sleep, entering sleep, is asleep and/or is awokenfrom a period of sleep. In response, the biometric monitoring devicemay, for example, acquire physiological data (of the type and in themanner as described herein) and/or determine physiological conditions ofthe user (of the type and in the manner as described herein). Forexample, a decrease or cessation of user motion combined with areduction in user heart rate and/or a change in heart rate variabilitymay indicate that the user has fallen asleep. Subsequent changes inheart rate variability and galvanic skin response may be used todetermine transitions of the user's sleep state between two or morestages of sleep (for example, into lighter and/or deeper stages ofsleep). Motion by the user and/or an elevated heart rate and/or a changein heart rate variability may be used to determine that the user hasawoken.

In an embodiment, the biometric monitoring device is one component of asystem for monitoring sleep, where the system comprises a secondarydevice capable of communicating with the biometric monitoring device andadapted to be placed near the sleeper (e.g., an alarm clock). Thesecondary device may have a shape and mechanical and/or magneticinterface to accept the biometric monitoring device for safe keeping,communication, and/or charging. Notably, the communication between thebiometric monitoring device and the secondary device may be providedthrough wireless communication techniques/methods and protocols such asBluetooth, Bluetooth 4.0, RFID, NFC, or WLAN. The secondary device maycomprise sensors to assist in sleep or environmental monitoring such as,for example, sensors that measure ambient light, noise and/or sound(e.g., to detect snoring), temperature, humidity, and air quality(pollen, dust, CO2, etc). In an embodiment, the secondary device maycommunicate with an external service such as www.fitbit.com or server(e.g., personal computer). Communication may be achieved through wired(e.g., Ethernet, USB) or wireless (e.g., WLAN, Bluetooth, RFID, NFC,cellular) circuitry and protocols to transfer data to and/or from thesecondary device. The secondary device may also act as a relay totransfer data to and/or from the biometric monitoring device to anexternal service such as www.fitbit.com or other service (e.g., news,social network updates, email, calendar notifications), or server (e.g.,personal computer, mobile phone, tablet). Calculation of the user'ssleep data may be executed on one or both devices or an external service(e.g., a cloud server) using data from one or both devices.

The secondary device may be equipped with a display to display dataobtained by the secondary device or data transferred to it by thebiometric monitoring device, the external service, or a combination ofdata from the biometric monitoring device, the secondary device, and/orthe external service. For example, the secondary device may display dataindicative of the user's heart rate, total steps for the day, activityand/or sleep goal achievement, the day's weather (measured by thesecondary device or reported for a location by an external service),etc. In another example, the secondary device may display data relatedto the ranking of the user relative to other users, such as total weeklystep count. In yet another embodiment, the biometric monitoring devicemay be equipped with a display to display data obtained by the biometricmonitoring device, the secondary device, the external service, or acombination of the three sources. In embodiments where the first deviceis equipped with a wakeup alarm (e.g., vibramotor, speaker), thesecondary device may act as a backup alarm (e.g., using an audiospeaker). The secondary device may also have an interface (e.g., displayand buttons or touch screen) to create, delete, modify, or enable alarmson the first and/or the secondary device.

In another embodiment, the biometric monitoring device may automaticallydetect or determine whether it is or is not attached to, disposed onand/or being worn by the user. In response to detecting or determiningthe biometric monitoring device is not attached to, disposed on and/orbeing worn by the user, the biometric monitoring device (or selectedportions thereof) may implement or be placed in a low power mode ofoperation—for example, the optical heart rate sensor and/or circuitrymay be placed in a lower power or sleep mode). For example, in oneembodiment, the biometric monitoring device includes one or more lightdetectors (photodiodes, phototransistors, etc) wherein, if at a givenlight intensity setting, one or more light detectors provides a lowreturn signal, the biometric monitoring device may interpret the data isindicative of the device not being worn. Upon such a determination, thedevice may reduce its power consumption—for example, “disable” or adjustthe operating conditions of the stress and/or heart rate detectionsensors and/or circuitry (for example, reduce duty cycle of or disablethe light source(s) and/or detector(s), and/or disable or attenuateassociated circuitry or portions thereof). In addition, the biometricmonitoring device may periodically determine (e.g., once per second) ifthe operating conditions of the stress and/or heart rate detectionsensors and/or associated circuitry should be restored to a normaloperating condition (for example, light source(s), detector(s) and/orassociated circuitry should return to a normal operating mode for heartrate detection). In another embodiment, the biometric monitoring devicerestores the operating conditions of the stress and/or heart ratedetection sensors and/or associated circuitry upon detection of atriggerable event—for example, upon detecting motion of the device (forexample, based on data from one or more motion sensor(s)) and/ordetecting a user input via the user interface (for example, a tap, bumpor swipe). In a related embodiment, the biometric monitoring device may,for power saving purposes, reduce its rate of heart rate measurementcollection to, for instance, one measurement per minute whilst the useris not highly active and the user may put the device into a mode ofoperation to generate measurements on demand or at a faster rate (e.g.,once per second), for instance, by pushing a button.

In one embodiment, the optical sensors (sources and/or detectors) may bedisposed on an interior or skin side of the biometric monitoring device(i.e., a side whereby the surface of the device contacts, touches and/orfaces the skin of the user (hereinafter “skin side”). (See, for example,FIGS. 2-7). In another embodiment, the optical sensors may be disposedon one or more sides of the device, including the skin side and one ormore sides of the device that face or are exposed to the ambientenvironment (environmental side). (See, for example, FIGS. 11-13).Notably, the data from such optical sensors may be representative ofphysiological data and/or environmental data. Indeed, in one embodiment,the optical sensors provide, acquire and/or detect information frommultiple sides of the biometric monitoring device whether or not thesensors are disposed on one or more of the multiple sides. For example,the optical sensors may obtain data related to the ambient lightconditions of the environment.

Where optical sensors are disposed or arranged on the skin side of thebiometric monitoring device, in operation, a light source emits lightupon the skin of the user and, in response, a light detector samples,acquires and/or detects a response or reflected light from the skin (andfrom inside the body). The one or more sources and detectors may bearranged in an array or pattern that enhances or optimizes the SNRand/or reduces or minimizes power consumption by light sources anddetectors. These optical detectors sample, acquire and/or detectphysiological data which may then be processed or analyzed (for example,by resident processing circuitry) to obtain data which is representativeof, for example, a user's heart rate, respiration, heart ratevariability, oxygen saturation (SpO2), blood volume, blood glucose, skinmoisture and skin pigmentation level.

The source(s) may emit light having one or more wavelengths which arespecific or directed to a type of physiological data to be collected.The optical detectors may sample, measure and/or detect one or morewavelengths that are also specific or directed to a type ofphysiological data to be collected and physiological parameter (of theuser) to be assessed or determined. For instance, in one embodiment, alight source emitting light having a wavelength in the green spectrum(for example, an LED that emits light having wavelengths correspondingto the green spectrum) and photodiode positioned to sample, measureand/or detect a response or reflection may provide data used todetermine or detect heart rate. In contrast, a light source emittinglight having a wavelength in the red spectrum (for example, an LED thatemits light having wavelengths corresponding to the red spectrum) and alight source emitting light having a wavelength in the infrared spectrum(for example, an LED that emits light having wavelengths correspondingto the IR spectrum) and photodiode positioned to sample, measure and/ordetect a response or reflection may provide data used to determine ordetect SpO2.

Indeed, in one embodiment, the color or wavelength of the light emittedby the LED (or set of LEDs) may be modified, adjusted and/or controlledin accordance with a predetermined type of physiological data beingacquired or conditions of operation. Here, the wavelength of the lightemitted by the LED is adjusted and/or controlled to optimize and/orenhance the “quality” of the physiological data obtained and/or sampledby the detector. For example, the color of the light emitted by the LEDmay be switched from infrared to green when the user's skin temperatureor the ambient temperature is cool in order to enhance the signalcorresponding to cardiac activity. (See, for example, FIG. 20).

The biometric monitoring device, in one embodiment, includes a window(for example, a visually opaque window) in the housing to facilitateoptical transmission between the optical sensors and the user. Here, thewindow may permit light (for example, of a selected wavelength) to beemitted by, for example, one or more LEDs, onto the skin of the user anda response or reflection to pass into the housing to be sampled,measured and/or detected by, for example, one or more photodiodes. Inone embodiment, the circuitry related to emitting and receiving lightmay be disposed in the interior of the device housing and underneath aplastic or glass layer (for example, painted with infrared ink) or aninfrared lens which permits infrared light to pass but not light in thehuman visual spectrum. In this way, the light transmission is invisibleto the human eye.

The biometric monitoring device may employ light pipes or other lighttransmissive structures. (See, for example, FIGS. 8-10). In this regard,in one embodiment, light is directed from the light source to the skinof the user through light pipes or other light transmissive structures.Scattered light from the user's body may be directed back to the opticalcircuitry through the same or similar structures. Indeed, thetransmissive structures may employ a material and/or optical design tofacilitate low light loss (for example, a lens) thereby improving SNR ofthe photo detector and/or reduce power consumption of the lightsource(s) (light emitters and/or light detectors). In one embodiment,the light pipes or other light transmissive structures may include amaterial that selectively transmits light having one or more specific orpredetermined wavelengths with higher efficiency than others, therebyacting as a bandpass filter. This bandpass filter may be tuned toimprove the signal of a specific physiological data type. For example,in one embodiment, an In-Mold-Labeling or “IML” light transmissivestructure may be implemented wherein the structure uses a material withpredetermined or desired optical characteristics to create a specificbandpass characteristic, for example, to pass infrared light withgreater efficiency than light of other wavelengths (for example, lighthaving a wavelength in human visible spectrum). In another embodiment, abiometric monitoring device may employ light transmissive structurehaving an optically opaque portion (including certain opticalproperties) and an optically transparent portion (including opticalproperties different from the optically opaque portion). Such astructure may be provided via a double-shot or two step molding processwherein optically opaque material is injected and optically transparentmaterial is injected. A biometric monitoring device implementing such alight transmissive structure may include different transmissive propertyfor different wavelengths depending on the direction of light travelthrough the structure. For example, in one embodiment, the opticallyopaque material may include a property of being reflective to a specificwavelength range so as to more efficiently transport light from thelight emitter(s) and from the user's body back to the skin detector(which may be of a different wavelength(s) relative to the wavelength(s)of the emitted light).

In another embodiment which implements light transmissive structures(for example, structures created or formed through IML), such structuresmay include a mask consisting of an opaque material which limits theaperture of one, some or all of the light source(s) and/or detector(s).In this way, the light transmissive structures selectively “define” apreferential volume of the body that light is emitted into and/ordetected from. Notably, other mask configurations may be employed orimplemented in connection with the inventions described and/orillustrated herein; all such mask configurations to, for example,improve the photoplethysmography signal, and which are implemented inconnection with the inventions described and/or illustrated herein, areintended to fall within the scope of the present inventions.

In any of the light transmissive structures described herein, thesurface of the optics or device body may include a hard coat paint, hardcoat dip, or optical coatings (such as anti-reflection), scratchresistance, anti-fog, and/or wavelength band block (such as ultravioletlight blocking). Such characteristics or materials may improve theoperation, accuracy and/or longevity of the biometric monitoring device.

In one embodiment, the biometric monitoring device includes a concave orconvex shape, on the skin side of the device, to focus light towards aspecific volume at a specific depth in the skin and increase theefficiency of light collected from that point into the photodetector.(See, for example, FIGS. 8-10). Where such a biometric monitoring devicealso employs light pipes to selectively and controllably route light, itmay be advantageous to shape the end of the light pipe with a degree ofcylindricity (for example, rather than radially symmetric). Such aconfiguration may improve the SNR by increasing the efficiency of lighttransferred from the emitter onto or into the skin of the user whiledecreasing “stray” light from being detected or collected by thephotodetector. In this way, the signal sampled, measured and/or detectedby the photodetector consists less of stray light and more of the user'sresponse to such emitted light (signal or data that is representative ofthe response to the emitted light).

In one embodiment, the components of the optical sensor are positionedon the skin side of the device and arranged or positioned to reduce orminimize the distance between (i) the light source(s) and/or associateddetector(s) and (ii) the skin of the user. (See, for example, FIG. 5).Such a configuration may improve the efficiency of light flux couplingbetween the components of the optical sensor and the user's body. Forexample, in one embodiment, the light source(s) and/or associateddetector(s) are disposed on a flexible or pliable substrate whichfacilitates the skin side of the device to conform (for example, withoutadditional processing) or be capable of being shaped (or compliant) toconform to the shape of the user's body part (for example, wrist, armankle and/or leg) to which the biometric monitoring device is coupled toattached during normal operation so that the light source(s) and/orassociated detector(s) are/is close to the skin of the user (i.e., withlittle to no gap between the skin side of the device and the juxtaposedsurface of the skin of the user. (See, FIG. 11). In one embodiment, thelight source(s) and/or associated detector(s) are disposed on a FlatFlex Cable or “FFC” or flexible PCB. In this embodiment, the flexible orpliable substrate (for example, FFC or flexible PCB) could connect to asecond substrate (for example, PCB) within the device having othercomponents disposed thereon (for example, the data processingcircuitry). Optical components of differing heights may be mounted todifferent “fingers” of flexible substrate and pressed or secured to thehousing surface such that the optical components are flush to thehousing surface. In one embodiment, the second substrate may be arelative inflexible or non-pliable substrate, fixed within the device,having other circuitry and components (passive and/or active) disposedthereon.

The biometric monitoring device is adapted to be worn or carried on thebody of a user. In preferred embodiments including the optical heartrate monitor, the device may be a wrist-worn or arm-mounted accessorysuch as a watch or bracelet. (See, for example, FIGS. 2-13). In oneembodiment, optical elements of the optical heart rate monitor arelocated on the interior or skin side of the biometric monitoring device,for example, facing the top of the wrist (i.e., the optical heart ratemonitor is juxtaposed the wrist) when the device is wrist mounted. (See,for example, FIGS. 2-7).

In another embodiment, the optical heart rate monitor is located on oneor more external or environmental side surfaces of the biometricmonitoring device. (See, for example, FIGS. 12 and 13). In thisembodiment, the user may touch an optical window (behind which opticalelements of the optical heart rate monitor are located) with a finger onthe opposing hand to initiate a heart rate measurement (and/or othermetrics related to heart rate such as heart rate variability) and/orcollect data which may be used to determine the user's heart rate(and/or other metrics related to heart rate). (See, for example, FIG.12). In one embodiment, the biometric monitoring device may trigger orinitiate the measurement(s) by detecting a (sudden) drop in incidentlight on the photodiode—for example, when the user's finger is placedover the optical window. In addition thereto, or in lieu thereof, aheart rate measurement (or other such metric) may be trigged by anIR-based proximity detector and/or capacitive touch/proximity detector(which may be separate from other detectors). Such IR-based proximitydetector and/or capacitive touch/proximity detector may be disposed inor on and/or functionally, electrically and/or physically coupled to theoptical window to detect or determine the presence of, for example, theuser's finger.

In yet another embodiment, the biometric monitoring device may include abutton which, when depressed, triggers or initiates heart ratemeasurement (and/or other metrics related to heart rate). The button maybe disposed in close proximity of the optical window to facilitate theuser pressing the button while the finger is disposed on the opticalwindow. (See, for example, FIG. 13). In one embodiment, the opticalwindow may be embedded in a push button. Thus, when the user presses thebutton, it could trigger a measurement via the user's finger whichdepresses the button. Indeed, the button may be given a shape and/orresistance to pressing that enhances or optimizes a pressure profileagainst the finger to provide high SNR during measurement or dataacquisition. In other embodiments (not illustrated), the biometricmonitoring device may take the form of a clip, smooth object, pendant,anklet, belt, etc. that is adapted to be worn on the body, clipped ormounted to an article of clothing, deposited in clothing (e.g., pocket),or deposited in an accessory (e.g., handbag).

In one specific embodiment, the biometric monitoring device includes aprotrusion on the skin or interior side of the device. (See, FIG. 2-11).When coupled to the user, the protrusion engages the skin with moreforce than the surrounding device body. In this embodiment, an opticalwindow or light transmissive structure (both of which are discussed indetail above) may form or be incorporated in a portion of theprotrusion. The light emitter(s) and/or detector(s) of the opticalsensor may be disposed or arranged in the protrusion juxtaposed thewindow or light transmissive structure. (See, for example, FIGS. 3 and11). As such, when attached to the user's body, the window portion ofthe protrusion of the biometric monitoring device engages the user'sskin with more force than the surrounding device body—thereby providinga more secure physical connection between the user's skin and theoptical window. That is, a protrusion improves sustained contact betweenthe biometric monitoring device and the user's skin which may reduce theamount of stray light measured by the photodetector, decrease motionbetween the biometric monitoring device and the user, and/or provideimproved local pressure to the user's skin; all of which may increasethe quality of the cardiac signal of interest. Notably, the protrusionmay contain other sensors that benefit from close proximity and/orsecure contact to the user's skin. These may be included in addition toor in lieu of a heart rate sensor and include sensors such as a skintemperature sensor (e.g., noncontact thermopile that utilizes theoptical window or thermistor joined with thermal epoxy to the outersurface of the protrusion), pulse oximeter, blood pressure sensor, EMG,or galvanic skin response sensor.

In addition thereto, or in lieu thereof, a portion of the skin side ofthe biometric monitoring device may include a friction enhancingmechanism or material. For example, the skin side of the biometricmonitoring device may include a plurality of raised or depressed regionsportions (for example, small bumps, ridges, grooves, and/or divots).Moreover, a friction enhancing material (for example, a gel-likematerial such as silicone) may be disposed on the skin side. Indeed, adevice back made out of gel may also provide friction while alsoimproving user comfort and preventing stray light from entering. Asnoted above, a friction enhancing mechanism or material may be usedalone or in conjunction with the biometric monitoring device having aprotrusion as described herein. In this regard, the biometric monitoringdevice may include a plurality of raised or depressed regions portions(for example, small bumps, ridges, grooves, and/or divots) in or on theprotrusion portion of the device. Indeed, such raised or depressedregions portions may be incorporated/embedded in or on a window portionof the protrusion. In addition thereto, or in lieu thereof, theprotrusion portion may consist of or be coated with a friction enhancingmaterial (for example, a gel-like material such as silicone). Notably,the use of a protrusion and/or friction may improve measurement accuracyof data acquisition corresponding to certain parameters (e.g., heartrate, heart rate variability, galvanic skin response, skin temperature,skin coloration, heat flux, blood pressure, blood glucose, etc.) byreducing motions of the sensor relative to the user's skin duringoperation, especially whilst the user is in motion.

Some or all of the interior or skin side housing of the biometricmonitoring device may also consist of a metal material (for example,steel, stainless steel, aluminum, magnesium, or titanium). Such aconfiguration may provide a structural rigidity. (See, for example, FIG.3.) In this embodiment, the device body may be designed to behypoallergenic through the use of a hypoallergenic “Nickel-Free”stainless steel. Notably, it may be advantageous to employ (at least incertain locations) a type of metal that is ferrous in properties (forexample, a grade of stainless steel that is ferrous). Under thiscircumstance, the biometric monitoring device (where it includes arechargeable energy source (for example, rechargeable battery) mayinterconnect with a charger using magnetic properties to secure thereto.In addition, biometric monitoring device may also engage a dock or dockstation using such magnetic properties to facilitate data transfer.Moreover, such a housing may provide enhanced electromagnetic shieldingwhich would enhance the integrity and reliability of the optical heartrate sensor and data acquisition process/operation. Furthermore, a skintemperature sensor may be physically and thermally coupled, for examplewith thermal epoxy, to the metal body to sense the temperature of theuser. In embodiments including a protrusion, the sensor may bepositioned near or in the protrusion to provide secure contact andlocalized thermal coupling to the user's skin.

In a preferred embodiment, one or more components of the optical sensor(which may, in one embodiment, located in a protrusion, and/or inanother embodiment, may be disposed or placed flush to the surface ofthe device) are attached, fixed, included and/or secured to thebiometric monitoring device via a liquid-tight seal (i.e., amethod/mechanism that prevents liquid ingress into the body of thebiometric monitoring device). For example, in one embodiment, a deviceback made out of a metal including but not limited to stainless steel,aluminum, magnesium, or titanium or a rigid plastic could provide astructure which is stiff enough to maintain the structural integrity ofthe device while accommodating a watertight seal for the sensor package.(See, FIGS. 3-7).

In a preferred embodiment, a package or module of the optical sensorwould be connected to the device with a pressure sensitive adhesive anda liquid gasket. (See, FIG. 7). Screws, rivets or the like may also beused, for example, if a stronger or more durable connection is requiredbetween the optical sensor package/module and the device body. Notably,the present inventions may also use watertight glues, hydrophobicmembranes such as Gore-Tex, o-rings, sealant, grease, or epoxy to secureor attach the optical sensor package/module and the device body.

As intimated above, the biometric monitoring device may include amaterial disposed on the skin or interior side which includes highreflectivity characteristic—for example, to polished stainless steel,reflective paint, and polished plastic. In this way, light scattered offthe skin side of the device may be reflected back into the skin in orderto, for example, improve the SNR. Indeed, this effectively increases theinput light signal as compared with a device body back that isnon-reflective. Notably, in one embodiment, the color of the skin orinterior side of the biometric monitoring device is selected to providecertain optical characteristics (for example, reflect certain orpredetermined wavelengths of light), in order to improve the signal ofcertain physiological data types. For example, where the skin orinterior side of the biometric monitoring is green, the measurements ofthe heart rate may be enhanced due to the preferential emission of awavelength of the light corresponding to the green spectrum. Where theskin or interior side of the biometric monitoring is red, themeasurements of the SpO2 may be enhanced due to the emissionpreferential of a wavelength of the light corresponding to the redspectrum. In one embodiment, the color of the skin or interior side ofthe biometric monitoring may be modified, adjusted and/or controlled inaccordance with a predetermined type of physiological data beingacquired.

FIG. 17 depicts an exemplary schematic block diagram of an opticalsensor where light is emitted from a light source toward the user's skinand the reflection is sensed by a light detector, which is subsequentlydigitized by an analog to digital converter (ADC). The intensity of thelight source may be modified (e.g., through a light source intensitycontrol module) to maintain a desirable reflected intensity signal. Forexample, the light source intensity may be reduced to avoid saturationof the output signal from the light detector. As another example, thelight source intensity may be increased to maintain the output signalfrom the light detector within a desired range of output values.Notably, the active control of the system may be achieved through linearor nonlinear control methods such as proportional-integral-derivative(PID) control, fixed step control, predictive control, neural networks,hysteresis, and the like, and may also employ information derived fromother sensors in the device such as motion, galvanic skin response, etc.FIG. 17 is provided for illustration and does not limit theimplementation of such a system to, for instance, an ADC integratedwithin a MCU, or the use of a MCU for that matter. Other possibleimplementations include the use of one or more internal or externalADCs, FPGAs, ASICs, etc.

In another embodiment, the system may incorporate the use of a sampleand hold circuit (or equivalent) to maintain the output of the lightdetector while the light source is turned off or attenuated to savepower. In embodiments of the present inventions where relative changesin the light detector output are of primary importance (e.g., heart ratemeasurement), the sample and hold circuit may not have to maintain anaccurate copy of the output of the light detector. In such cases, thesample and hold may be reduced to, for example, a diode (e.g., Schottkydiode) and capacitor. The output of the sample and hold may be presentedto an analog signal conditioning circuit (e.g., a Sallen-Key bandpassfilter, level shifter, and/or gain circuit) to condition and amplify thesignal within frequency bands of interest (e.g., 0.1 Hz to 10 Hz forcardiac or respiratory function) which is then digitized by the ADC.See, for example, FIG. 18.

In operation, this removes the DC and low frequency components of thesignal and help resolve the AC component related to heart rate and/orrespiration. The embodiment may also include the analog signalconditioning circuitry (not illustrated) for variable gain settings thatcan be controlled to provide a suitable signal (e.g., not saturated).The performance characteristics (e.g., slew rate and/or gain bandwidthproduct) and power consumption of the light source, light detector,and/or sample and hold may be significantly higher than the analogsignal conditioning circuit to enable fast duty cycling of the lightsource. In an embodiment, the power provided to the light source andlight detector may be controlled separately from the power provided tothe analog signal conditioning circuit to provide additional powersavings. In another embodiment, the output of the light detector and/orsample and hold may be sampled by an ADC in addition to or in lieu ofthe analog signal conditioning circuit to control the light intensity ofthe light source or to measure the physiologic parameters of interestwhen, for example, the analog signal conditioning circuit is not yetstable after a change to the light intensity setting. Notably, becausethe physiologic signal of interest is typically small relative to theinherent resolution of the ADC, in some embodiments, the referencevoltages and/or gain of the ADC may be adjusted to enhance signalquality, or the ADC may be oversampled. In yet another embodiment, thedevice may digitize the output of only the sample and hold circuit by,for example, oversampling, adjusting the reference voltages and/or gainof the ADC, or using a high resolution ADC. See, for example, FIG. 19.

In another embodiment, the system may incorporate a differentialamplifier to amplify the relative changes in the output of the lightdetector output. See, for example, FIG. 22. In an embodiment, a digitalaverage or digital lowpass filtered signal is subtracted from the outputof the light detector output and amplified before it is digitized by theADC. In another embodiment, an analog average or analog lowpass filteredsignal is subtracted from the output of the light detector through, forexample, the use of a sample and hold circuit and analog signalconditioning circuitry. The power provided to the light source, lightdetector, and differential amplifier may be controlled separately fromthe power provided to the analog signal conditioning circuit to improvepower savings.

In an embodiment, the light detector module may incorporate atransimpedance amplifier stage with variable gain. Such a configurationmay avoid or minimize saturation from bright ambient light and/or brightemitted light from the light source. For example, the gain of thetransimpedance amplifier may be automatically reduced with a variableresistor and/or multiplexed set of resistors in the negative feedbackpath of the transimpedance amplifier. In embodiments of the presentinventions, the device may incorporate little to no optical shieldingfrom ambient light by amplitude modulating the intensity of the lightsource and demodulating the output of the light detector (e.g.,synchronous detection). See, for instance, FIG. 21. In other aspects, ifthe ambient light is of sufficient brightness to obtain a heart ratesignal, the light source may be reduced in brightness and/or turned offcompletely.

In yet another embodiment, the aforementioned processing techniques maybe used in combination to optically measure physiological parameters ofthe user. See, for example, FIG. 23. This topology may allow the systemto operate in a low power measurement state and circuit topology whenapplicable and adapt to a higher power measurement state and circuittopology as necessary. For instance, the system may measure thephysiologic parameter (e.g., heart rate) of interest using analog signalconditioning circuitry whilst the user is immobile or sedentary toreduce power consumption, but switch to oversampled sampling of thelight detector output directly whilst the user is active. There are manyinventions described and illustrated herein. While certain embodiments,features, attributes and advantages of the inventions have beendescribed and illustrated, it should be understood that many others, aswell as different and/or similar embodiments, features, attributes andadvantages of the present inventions, are apparent from the descriptionand illustrations. As such, the above embodiments of the inventions aremerely exemplary. They are not intended to be exhaustive or to limit theinventions to the precise forms, techniques, materials and/orconfigurations disclosed. Many modifications and variations are possiblein light of this disclosure.

In embodiments where the device includes a heart rate monitor,processing of the signal to obtain heart rate measurements may comprisefiltering and/or signal conditioning such as bandpass filtering (e.g.,Butterworth filter). To counteract the large transients that may occurin the signal and/or to improve convergence of said filtering, nonlinearapproaches may be employed such as neural networks or slew ratelimiting. Data from the sensors on the device such as motion, galvanicskin response, skin temperature, etc., may be used to adjust the signalconditioning methods employed. Under certain operating conditions, theheart rate of the user may be measured by counting the number of signalpeaks within a time window or utilizing the fundamental frequency orsecond harmonic of the signal (e.g., though a fast Fourier transform(FFT)). In other cases, such as motion, FFTs may be performed on thesignal and spectral peaks extracted, which are subsequently processed bya multiple target tracker which starts, continues, merges, and deletestracks of the spectra. In one embodiment, a similar set of operationsare performed on the motion signal and the output is used to do activitydiscrimination (e.g., sedentary, walking, running, sleeping, lying down,sitting, biking, typing, elliptical, weight training) which is used toassist the multiple target tracker. For instance, it may be determinedthat the user was stationary and has begun to move and this informationcan be used to preferentially bias the track continuation towardincreasing frequencies. Similarly, the activity discriminator maydetermine that the user has stopped running or is running slower andthis information may be used to preferentially bias the trackcontinuation toward decreasing frequencies. Tracking may be achievedwith single-scan or multi-scan multi-target tracker topologies such asjoint probabilistic data association trackers, multiple hypothesistracking, nearest neighbor, etc. Estimation and prediction in thetracker may be done through Kalman filters, spline regression, particlefilters, interacting multiple model filters, etc. A track selectormodule uses the output tracks from the multiple spectra tracker andestimates the user's heart rate. The estimate may be taken as themaximum likelihood track, a weight sum of the tracks against theirprobabilities of being the heart rate, etc. The activity discriminatormay furthermore influence the selection and/or fusion to get the heartrate estimate. For instance, if the user is sleeping, sitting, lyingdown, or sedentary, a prior probability may be skewed toward heart ratesin the 40-80 bpm range; whereas if the user is running, jogging, ordoing other vigorous exercise, a prior probability may be skewed towardelevated heart rates in the 90-180 bpm range. The influence of theactivity discriminator may be based on the speed of the user. Theestimate may be shifted toward (or wholly obtained by) the fundamentalfrequency of the signal when the user is not moving. The track thatcorresponds to the user's heart rate may be selected based on criteriathat is indicative of changes in activity; for instance, if the userbegins to walk from being stationary, the track that illustrates a shifttoward higher frequency may be preferentially chosen.

The acquisition of a good heart rate signal may be indicated to the userthrough a display on the biometric monitoring device or another devicein wired or wireless communication with the biometric monitoring device(e.g., a Bluetooth Low Energy equipped mobile phone). In a preferredembodiment, the biometric monitoring device includes a signal strengthindicator which is represented by the pulsing of a LED that is viewableby the user. The pulsing may be timed or correlated to be coincidentwith the user's heart beat. The intensity, pulsing rate and/or color ofthe LED may be modified or adjusted to suggest signal strength. Forexample, a brighter LED intensity may represent a stronger signal or ina RGB LED configuration, a green colored LED may represent a strongersignal.

In a preferred embodiment, the strength of the heart rate signal may bedetermined by the energy (e.g., squared cumulative sum) of the signal ina frequency band of, for instance, 0.5 Hz to 4 Hz. In anotherembodiment, the biometric monitoring device of the present invention mayhave a strain gauge, pressure sensor, and/or force sensor which may beincorporated or constructed into the housing and/or in the band (inthose embodiments where the biometric monitoring device is attached toor mounted with a band like a watch, bracelet, and/or armband—which maythen be secured to the user). A signal quality metric may be calculatedwith these contact sensors either alone or in combination with data fromthe heart rate signal.

In another embodiment, the biometric monitoring device may monitor heartrate optically through an array of photodetectors such as a grid ofphotodiodes or a CCD camera. Motion of the optical device with respectto the skin may be tracked through feature tracking of the skin and/oradaptive motion correction using an accelerometer and gyroscope. Thedetector array may be in contact with the skin or offset at a smalldistance away from the skin. The detector array and its associatedoptics may be actively controlled (e.g., with a motor) to maintain astabilized image of the target and acquire a heart rate signal. Thisoptomechanical stabilization may be achieved using information frommotion sensors (e.g., gyroscope) or image features. In one embodiment,the biometric monitoring device may implement relative motioncancellation using a coherent or incoherent light source to illuminatethe skin and a photodetector array with each photodetector associatedwith comparators for comparing the intensity between neighboringdetectors—obtaining a so-called speckle pattern which may be trackedusing a variety of image tracking techniques such as optical flow,template matching, edge tracking, etc. In this embodiment, the lightsource used for motion tracking may be different than the light sourceused in the optical heart rate monitor.

In another embodiment, the biometric monitoring device may consist of aplurality of photodetectors and photoemitters distributed along thesurface of the device that touches the user's skin (i.e., the skin sideof the biometric monitoring device). (See, for example, FIGS. 2-11). Inthe example of a bracelet, for instance, there may be a plurality ofphotodetectors and photoemitters placed along the circumference of theinterior of the band. (See, for example, FIG. 11). A heart rate signalquality metric at each site may be calculated to determine the best orset of best sites for estimating the user's heart rate. Subsequently,some of the sites may be disabled or turned off to, for example, reducepower consumption. The device may periodically check the heart ratesignal quality at some or all of the sites to enhance, monitor and/oroptimize signal and/or power efficiency.

In another embodiment, biometric monitoring device of the presentinvention may include a heart rate monitoring system including aplurality of sensors such as optical, acoustic, pressure, electrical(e.g., EKG), and motion and fuse the information from two or more ofthese sensors to provide an estimate of heart rate and/or mitigate noiseinduced from motion.

In addition to heart rate monitoring (or other biometric monitoring), orin lieu thereof, the biometric monitoring device, in one embodiment,includes optical sensors to track or detect time and duration ofultraviolet light exposure, total outdoor light exposure, the type oflight source and duration and intensity of that light source(fluorescent light exposure, incandescent bulb light exposure, halogen,etc), exposure to television (based on light type and flicker rate),whether the user is indoors or outdoors, time of day and location basedon light conditions. In one embodiment, the ultraviolet detection sensormay consist of a reverse biased LED emitter driven as a light detector.The photocurrent produced by this detector may be characterized by, forinstance, measuring the time it takes for the LED's capacitance (oralternately a parallel capacitor) to discharge.

All of the optical sensors could be used in conjunction with othersensors to improve detection of the data described above or be used toaugment detection of other types of physiological or environmental data.

Where the biometric monitoring device includes an audio or passiveacoustic sensor, the device may contain one or more passive acousticsensors that detect sound and pressure and which can include but not belimited to microphones, piezo film, etc. The acoustic sensors may bedisposed on one or more sides of the device, including the side thattouches or faces the skin (skin side) and the sides that face theenvironment (environmental sides).

The biometric monitoring device of the present invention may alsoinclude galvanic skin response (GSR) circuitry to measure the responseof the user's skin to emotional and physical stimuli or physiologicalchanges (e.g., the transition of sleep stage). In one embodiment, theinvention is a wrist or arm-mounted device incorporating a bandcomprised of conductive rubber or fabric so that the galvanic skinresponse electrodes may be hidden in the band. Because the galvanic skinresponse circuitry may be subjected to changing temperatures andenvironmental conditions, it may also include circuitry to enableautomatic calibration, such as two or more switchable referenceresistors in parallel or series with the human skin/electrode path thatallows real-time measurement of known resistors to characterize theresponse of the galvanic skin response circuit. The reference resistorsmay be switched into and out of the measurement path such that they aremeasured independently and/or simultaneously with the human skin.

The skin side sensors would detect any type of sound transmitted throughthe body and the sensors could be arranged in an array or pattern thatoptimizes both the SNR and power consumption. These sensors could detectrespiration (by listening to the lung), respiratory sounds (breathing,snoring) and problems, heart rate (listening to the heart beat), user'svoice (via sound transmitted from the vocal cords throughout the body)

Environmental Sensors

The biometric monitoring device of the present inventions may use one,some or all of the following environmental sensors to, for example,acquire the environmental data, including environmental data outlined inthe table below. The biometric monitoring device is not limited to thenumber or types of sensors specified below but may employ other sensorsthat acquire environmental data outlined in the table below. Allcombinations and permutations of environmental sensors and/orenvironmental data are intended to fall within the scope of the presentinventions. Additionally, the device may derive environmental data fromthe corresponding sensor output data, but is not limited to the types ofenvironmental data that it could derive from said sensor.

Notably, the biometric monitoring device of the present inventions mayone or more, or all of the environmental sensors described herein andone or more, or all of the physiological sensors described herein.Indeed, biometric monitoring device of the present inventions mayacquire any or all of the environmental data and physiological datadescribed herein using any sensor now known or later developed—all ofwhich are intended to fall within the scope of the present inventions.

TABLE Environmental Sensors Environmental data acquired Motion DetectorLocation Potential Embodiments: Inertial, Gyro or Accelerometer GPSPressure/Altimeter sensor Elevation Ambient Temp temperature LightSensor Indoor vs outdoor Watching TV (spectrum/flicker rate detection)Optical data transfer- initiation, QR codes, etc. ultraviolet lightexposure Audio Indoor vs Outdoor Compass Location Potential Embodiments:3 Axis Compass

In one embodiment, the biometric monitoring device may include analtimeter sensor, for example, disposed or located in the interior ofthe device housing. (See, for example, FIGS. 25 and 26). In such a case,the device housing may have a vent that allows the interior of thedevice to measure, detect, sample and/or experience any changes inexterior pressure. In one embodiment, the vent prevents water fromentering the device while facilitating measuring, detecting and/orsampling changes in pressure via the altimeter sensor. For example, anexterior surface of the biometric monitoring device may include a venttype configuration or architecture (for example, a Gore™ vent) whichallows ambient air to move in and out of the housing of the device(which allows the altimeter sensor to measure, detect and/or samplechanges in pressure), but reduces, prevents and/or minimizes water andother liquids flow into the housing of the device.

The altimeter sensor, in one embodiment, may be filled with gel thatallows the sensor to experience pressure changes outside of the gel. Theuse of a gel filled altimeter may give the device a higher level ofenvironmental protection with or without the use of an environmentallysealed vent. The device may have a higher survivability rate with a gelfilled altimeter in locations including but not limited to those thathave high humidity, a clothes washer, a dish washer, a clothes dryer, asteam room, the shower, a pool, and any location where the device may beexposed to moisture, exposed to liquid or submerged in liquid.

Sensors Integration/Signal Processing

The biometric monitoring device of the present invention may use datafrom two or more sensors to calculate the corresponding physiological orenvironmental data as seen in the table below (for example, data fromtwo or more sensors which are used in combination). The device mayinclude but is not limited to the number, types, or combinations ofsensors specified below. Additionally, the device may derive theincluded data from the corresponding sensor combinations, but is notlimited to the number or types of data that could be calculated from thecorresponding sensor combinations.

TABLE Data derived from signal processing of Sensor Integrationsmultiple sensors Skin Temp and Ambient Temp Heat Flux Heart Rate andMotion Elevation gain Motion detector and other user's motion Users inthe proximity detector Motion, any heart rate sensor, galvanic skinSit/Standing detection response Any heart rate, heart rate variabilitysensor, Sleep Phase detection respiration, motion Sleep Apnea detectionAny heart rate sensor and/or wetness sensor, Resting Heart rate and/ormotion detector Active Heart Rate Heart rate while asleep Heart ratewhile sedentary Any heart rate detector Early detection of heartproblems: cardiac Arrhythmia Cardiac arrest Multiple heart ratedetectors Pulse transit time Audio and/or strain gauge Typing detectionGPS and photoplethysmography (PPG) location- stress correlation:determination of stressful regions determination of low stress regionsActivity specific heart rate resting heart rate active heart rateAutomatic activity classification and activity heart rate determinationHeart rate, galvanic skin response, User fatigue, for example whileexercising accelerometer and respiration

In one embodiment, the device may also include a near-fieldcommunication (NFC) receiver/transmitter to detect proximity to anotherdevice, such as a mobile phone. When the device is brought into close ordetectable proximity to the second device, it may trigger the start ofnew functionality on the second device (e.g., the launching of an “app”on the mobile phone and radio syncing of physiological data from thedevice to the second device). (See, for example, FIG. 16). Indeed, thebiometric monitoring device of the present invention may implement anyof the circuitry and techniques described and/or illustrated in U.S.Provisional Patent Application 61/606,559, filed Mar. 5, 2012, “NearField Communication System, and Method of Operating Same”, inventor:James Park (the contents of which are incorporated herein by reference).

In another embodiment, the biometric monitoring device includes alocation sensor (for example, GPS circuitry) and heart rate sensor (forexample, photoplethysmography circuitry) to generate GPS or locationrelated data and heart rate related data, respectively. (See, forexample, FIGS. 25 and 26). The biometric monitoring device may thenfuse, process and/or combine data from these two sensors/circuitry to,for example, determine, correlate and/or “map” geographical regionsaccording to physiological data (for example, heart rate, stress,activity level, quantity of sleep and/or caloric intake). In this way,the biometric monitoring device may identify geographical regions thatincrease or decrease a measurable user metric including but not limitedto heart rate, stress, activity, level, quantity of sleep and/or caloricintake.

In addition thereto, or in lieu thereof, the biometric monitoring devicemay employ the GPS related data and photoplethysmography related data(notably, each of which may be considered data streams), to determine orcorrelate the user's heart rate according to activity levels—forexample, as determined by the user's acceleration, speed, locationand/or distance traveled (as measured by the GPS and/or determined fromGPS related data). (See, for example, FIGS. 25 and 26). Here, in oneembodiment, heart rate as a function of speed may be “plotted” for theuser, or the data could be broken down into different levels includingbut not limited to sleeping, resting, sedentary, moderately active,active, and highly active.

Indeed, the biometric monitoring device may also correlate GPS relateddata to a database of predetermined geographic locations that haveactivities associated with them for a set of predetermined conditions.For example, activity determination and corresponding physiologicalclassification (for example, heart rate classification) may includecorrelating a user's GPS coordinates that correspond to location(s) ofexercise equipment, health club and/or gym and physiological data. Underthese circumstances, a user's heart rate during, for example a gymworkout, may be automatically measured and displayed. Notably, manyphysiological classifications may be based on GPS related data includinglocation, acceleration, altitude, distance and/or velocity. Such adatabase including geographic data and physiological data may becompiled, developed and/or stored on the biometric monitoring deviceand/or external computing device. Indeed, in one embodiment, the usermay create their own location database or add to or modify the locationdatabase to better classify their activities.

In another embodiment, the user may simultaneously wear multiplebiometric monitoring devices (having any of the features describedherein). The devices of this embodiment may communicate with each otheror a remote device using wired or wireless circuitry to calculate, forexample, biometric or physiologic qualities or quantities that, forexample, may be difficult or inaccurate to calculate otherwise such aspulse transit time. The use of multiple sensors may also improve theaccuracy and/or precision of biometric measurements over the accuracyand/or precision of a single sensor. For example, having a device on thewaist, wrist, and ankle could improve the detection of the user taking astep over that of a single device in only one of those locations. Signalprocessing could be performed on the devices in a distributed orcentralized method to provide improved measurements over that of asingle device. This signal processing could also be performed remotelyand communicated back to the devices after processing.

Processing Task Delegation

The biometric monitoring device may include one or more processors.(See, for example, FIGURES L and M). For example, an independentapplication processor may be used to store and execute applications thatutilize sensor data acquired and processed by one or more sensorprocessors (processor(s) that process data from physiological,environmental and/or activity sensors). In the case where there aremultiple sensors, there may also be multiple sensor processors. Anapplication processor may have sensors directly connected to it as well.Sensor and application processors may exist as separate discrete chipsor exist within the same packaged chip (multi-core). A device may have asingle application processor, or an application processor and sensorprocessor, or a plurality of application processors and sensorprocessors.

In one embodiment, the sensor package could be placed on a daughterboardthat consists of all of the analog components. This board may have someof the electronics typically found on the main PCB such as, but notlimited to, transimpedance amplifiers, filtering circuits, levelshifters, sample and hold circuits, and a microcontroller unit. Such aconfiguration may allow the daughterboard to be connected to the mainPCB through the use of a digital connection rather than analog inaddition to any necessary power or ground connections. A digitalconnection may have a variety of advantages over the analog daughter tomain PCB connection including but not limited to a reduction in noiseand a reduction in the number of necessary cables. The daughterboard maybe connected to the main board through the use of a flex cable or set ofwires.

Multiple applications can be stored on an application processor. Anapplication can consist of executable code and data for the application,but not limited to these. Data can consist of graphics or otherinformation required to execute the application or it can be informationoutput generated by the application. The executable code and data forthe application can both reside on the application processor or the datafor the application can be stored and retrieved from an external memory.External memory may include but is not limited to NAND flash, NOR flash,flash on another processor, other solid-state storage, mechanical oroptical disks, RAM.

The executable code for an application can also be stored on an externalmemory. When an application is requested to be executed, the applicationprocessor retrieves the executable code and/or data from the externalstorage and executes it. The executable code can be temporarily orpermanently stored on the memory or storage of the applicationprocessor. This allows the application to be executed more quickly onthe next execution request, since the step of retrieval is eliminated.When the application is requested to be executed, the applicationprocessor can retrieve all of the executable code of the application orportions of the executable code. In the latter case, only the portion ofexecutable code required at that moment is retrieved. This allowsapplications that are larger than the application processor's memory orstorage to be executed.

The application processor can also have memory protection features toprevent applications from overwriting, corrupting, interrupting,blocking, or otherwise interfering with other applications, the sensorsystem, the application processor, or other components of the system.

Applications can be loaded onto the application processor and anyexternal storage via a variety of wired, wireless, optical, capacitivemechanisms including but not limited to USB, Wi-Fi, Bluetooth, BluetoothLow Energy, NFC, RFID, Zigbee.

Applications can be cryptographically signed with an electronicsignature. The application processor can restrict the execution ofapplications to those that have the correct signature.

Methods of Wearing the Device

The biometric monitoring device may include a housing having a size andshape that facilitates fixing the device to the user's body duringnormal operation wherein the device, when coupled to the user, does notmeasurably or appreciably impact the user's activity. The device may beworn in different ways depending on the specific sensor packageintegrated into the device and the data that the user would like toacquire.

A user may wear one or more of the biometric monitoring devices of thepresent invention on their wrist or ankle (or arm or leg) with the useof a band that is flexible and thereby readily fitted to the user. Theband may have an adjustable circumference, therefore allowing it to befitted to the user. The band may be constructed from a material thatshrinks when exposed to heat, therefore allowing the user to create acustom fit. The band may be detachable from the “electronics” portion ofthe biometric monitoring device and, if necessary, replaceable.

In a preferred embodiment, the biometric monitoring device consists oftwo major components—a body (containing the “electronics”) and a band(that facilitates attaching the device to the user). The body mayinclude a housing (made, for example, of a plastic or plastic-likematerial) and extension tabs projecting from the body (made, forexample, from a metal or metal-like material). (See, for example, FIGS.4-7). The band (made, for example, of a thermoplastic urethane) isattachable to the body mechanically or adhesively. The band may extendout a fraction of the circumference of the user's wrist. The distal endsof the urethane band may be connected with a Velcro, a hook and/or loopelastic fabric band that loops around a D-Ring on one side and thenattaches back to itself. In this embodiment, the closure mechanism wouldallow the user infinite band length adjustment (unlike an indexed holeand mechanical clasp closure). The Velcro or fabric could be attached tothe band in a manner that allows it to be replaced (for example, if itis worn or otherwise undesirable to wear before the useful or end oflife of the device). In one embodiment, the Velcro or fabric would beattached with screws or rivets and/or glue, adhesive and/or clasp to theband.

The biometric monitoring device of the present invention may also beintegrated and worn in a necklace, chest band, bra, patch, glasses,earring, or toe band. The device may be built in such a way that thesensor package/portion of the biometric monitoring device is removableand can be worn in any number of ways including, but not limited to,those listed above.

In another embodiment, the biometric monitoring device of the presentinvention may be worn clipped to an article of clothing or deposited inclothing (e.g., pocket) or an accessory (e.g., handbag, backpack,wallet). Because the biometric monitoring device may not be near theuser's skin, in embodiments that include heart rate measurements, themeasurements may be obtained in a discrete, “on demand” context by theuser manually placing the device into a specific mode (e.g., depressinga button, covering a capacitive touch sensor, etc., possibly with theheart rate sensor embedded in the button/sensor) or automatically oncethe user places the device against the skin (e.g., applying the fingerto an optical heart rate sensor).

User Interface with the Device

The biometric monitoring device may include one or more methods ofinteracting with the device either locally or remotely.

In one embodiment, the biometric monitoring device may convey datavisually through a digital display. The physical embodiment of thisdisplay may use any one or a plurality of display technologiesincluding, but not limited to one or more of LED, LCD, AMOLED, E-Ink,Sharp display technology, graphical display, and other displaytechnologies such as TN, HTN, STN, FSTN, TFT, IPS, and OLET. Thisdisplay could show data acquired or stored locally on the device orcould display data acquired remotely from other devices or Internetservices. The device may use a sensor (for example, an Ambient LightSensor, “ALS”) to control or adjust screen backlighting. For example, indark lighting situations, the display may be dimmed to conserve batterylife, whereas in bright lighting situations, the display may increaseits brightness so that it is more easily read by the user.

In another embodiment, the device may use single or multicolor LEDs toindicate a state of the device. States that the device indicate mayinclude but are not limited to biometric states such as heart rate orapplication states such as an incoming message, a goal has been reached.These states may be indicated through the LED's color, being on, off, anintermediate intensity, pulsing (and/or rate thereof), and/or a patternof light intensities from completely off to highest brightness. In oneembodiment, an LED may modulate its intensity and/or color with thephase and frequency of the user's heart rate.

In a preferred embodiment, the use of an E-Ink display would allow thedisplay to remain on without the battery drain of a non-reflectivedisplay. This “always-on” functionality may provide a pleasant userexperience in the case of, for example, a watch application where theuser may simply glance at the device to see the time. The E-Ink displayalways displays content without comprising the battery life of thedevice, allowing the user to see the time as they would on a traditionalwatch.

The device may use a light such as an LED to display the heart rate ofthe user by modulating the amplitude of the light emitted at thefrequency of the user's heart rate. The device may depict heart ratezones (e.g., aerobic, anaerobic) through the color of an LED (e.g.,green, red) or a sequence of LEDs that light up in accordance withchanges in heart rate (e.g., a progress bar). The device may beintegrated or incorporated into another device or structure, forexample, glasses or goggles, or communicate with glasses or goggles todisplay this information to the user.

The biometric monitoring device may also convey information to a userthrough the physical motion of the device. One such embodiment of amethod to physically move the device is the use of a vibration inducingmotor. The device may use this method alone, or in combination with aplurality of motion inducing technologies.

The device may convey information to a user through audio. A speakercould convey information through the use of audio tones, voice, songs,or other sounds.

These three information communication methods—visual, motion, andauditory—may be used alone or in any combination with each other oranother method of communication to communicate any one or plurality ofthe following information in the below table:

TABLE That a user needs to wake up at certain time That a user shouldwake up as they are in a certain sleep phase That a user should go tosleep as it is a certain time That a user should wake up as they are ina certain sleep phase and in a preselected time window bounded by theearliest and latest time that the user wants to wake up. An email wasreceived The user has been inactive for a certain period of time.Notably, this may integrate with other applications like, for instance,a meeting calendar or sleep tracking application to block out, reduce,or adjust the behavior of the inactivity alert. The user has been activefor a certain period of time The user has an appointment or calendarevent The user has reached a certain activity metric The user has gone acertain distance The user has reached a certain mile pace The user hasreached a certain speed The user has accumulated a certain elevationgain The user has taken a certain number of steps The user has had aheart rate measurement recently The user's heart rate has reached acertain level The user has a normal, active, or resting heart rate of aspecific value or in a specific range The user's heart rate has enter orexited a certain goal range or training zone The user has a new heartrate “zone” goal to reach, as in the case of heart rate zone trainingfor running, bicycling, swimming, etc. activities The user has swum alap or completed a certain number of laps in a pool An external devicehas information that needs to be communicated to the user such as anincoming phone call or any one of the above alerts The user has reacheda certain fatigue goal or limit. In one embodiment, fatigue may bedetermined through a combination of heart rate, galvanic skin response,motion sensor, and/or respiration data

These examples are provided for illustration and are not intended tolimit the scope of information that may be communicated by the device(for example, to the user). Note that the data used to determine whetheror not an alert is met may be acquired from a first device and/or one ormore secondary devices. The device itself may determine whether thecriteria for an alert has been met. Alternatively, a computing device incommunication with the device (e.g. a server and/or a mobile phone) maydetermine when the alert should occur. In view of this disclosure, otherinformation that the device may communicate to the user can beenvisioned by one of ordinary skill in the art. For example, the devicemay communicate with the user when a goal has been met. The criteria formeeting this goal may be based on physiological, contextual, andenvironmental sensors on a first device, and/or other sensor data fromone or more secondary devices. The goal may be set by the user or may beset by the device itself and/or another computing device incommunication with the device (e.g. a server). In an exemplaryembodiment, the device may vibrate when a biometric goal is met.

The biometric monitoring device of the present invention may be equippedwith wireless and/or wired communication circuitry to display data on asecondary device in real time. For example, the invention may be able tocommunicate with a mobile phone via Bluetooth Low Energy in order togive real-time feedback of heart rate, heart rate variability, and/orstress to the user. The invention may coach or grant “points” for theuser to breathe in specific ways that alleviate stress. Stress may bequantified or evaluated through heart rate, heart rate variability, skintemperature, changes in motion-activity data and/or galvanic skinresponse.

The biometric monitoring device may receive input from the user throughone or more local or remote input methods. One such embodiment of localuser input could use a sensor or set of sensors to translate a user'smovement into a command to the device. Such motions could include butmay not be limited to tapping, rolling the wrist, flexing one or moremuscles, and swinging. Another user input method may be through the useof a button of type, but not limited to the types, capacitive touchbutton, capacitive screen, and mechanical button. In one embodiment, theuser interface buttons may be made of metal. In the case that the screenuses capacitive touch detection, it may always be sampling and ready torespond to any gesture or input without an intervening event such aspushing a physical button. The device may also take input through theuse of audio commands. All of these input methods may be integrated intothe device locally or integrated into a remote device that cancommunicate with the device either through a wired or wirelessconnection. In addition, the user may also be able to manipulate thedevice through a remote device. In one embodiment, this remote devicecould have Internet connectivity.

In one embodiment, the biometric monitoring device of the presentinvention may act as a wrist-mounted vibrating alarm to silently wakethe user from sleep. The biometric monitoring device may track theuser's sleep quality, waking periods, sleep latency, sleep efficiency,sleep stages (e.g., deep sleep vs REM), and/or other sleep-relatedmetrics through one or a combination of heart rate, heart ratevariability, galvanic skin response, motion sensing (e.g.,accelerometer, gyroscope, magnetometer), and skin temperature. The usermay specify a desired alarm time and the invention may use one or moreof the sleep metrics to determine an optimal time to wake the user. Inone embodiment, when the vibrating alarm is active, the user may causeit to hibernate or turn off by slapping or tapping the device (which isdetected, for example, via motion sensor(s), a pressure/force sensorand/or capacitive touch sensor in the device). In one embodiment, thedevice may attempt to arouse the user at an optimum point in the sleepcycle by starting a small vibration at a specific user sleep stage ortime prior to the alarm setting. It may progressively increase theintensity or noticeability of the vibration as the user progressestoward wakefulness or toward the alarm setting. (See, for example, FIG.14).

In another aspect, the biometric monitoring device may be configured orcommunicated with using onboard optical sensors such as the componentsin an optical heart rate monitor.

Wireless Connectivity and Data Transmission

The biometric monitoring device of the present invention may include ameans of wireless communication to transmit and receive information fromthe Internet and/or other devices. The wireless communication mayconsist of one or more means such as Bluetooth, ANT, WLAN, power-linenetworking, and cell phone networks. These are provided as examples anddo not exclude other wireless communication methods existent or that areyet to be invented.

The wireless connection is two ways. The device may transmit,communicate and/or push its data to other peripheral devices and/or theInternet. The device may also receive, request and/or pull data fromother peripheral devices and/or the Internet.

The biometric monitoring device may act as a relay to providecommunication for other devices to each other or to the Internet. Forexample, the device may connect to the Internet via WLAN but also beequipped with an ANT radio. An ANT device may communicate with thedevice to transmit its data to the Internet through the device's WLAN(and vice versa). As another example, the device may be equipped withBluetooth. If a Bluetooth-enabled smart phone comes within reach of thedevice, the device may transmit data to or receive data from theInternet through the smart phone's cell phone network. Data from anotherdevice may also be transmitted to the device and stored (and vice versa)or transmitted at a later time.

The present invention may also include streaming or transmitting webcontent for displaying on the biometric monitoring device. The followingare typical examples:

TABLE  1. Historical graphs of heart rate and/or other data measured bythe device but stored remotely  2. Historical graphs of user activityand/or foods consumed and/or sleep data that are measured by otherdevices and/or stored remotely (e.g., fitbit.com)  3. Historical graphsof other user-tracked data stored remotely. Examples include heart rate,blood pressure, arterial stiffness, blood glucose levels, cholesterol,duration of TV watching, duration of video game play, mood, etc.  4.Coaching and/or dieting data based on one or more of the user's heartrate, current weight, weight goals, food intake, activity, sleep, andother data.  5. User progress toward heart rate, weight, activity,sleep, and/or other goals.  6. Summary statistics, graphics, badges,and/or metrics (e.g., “grades”) to describe the aforementioned data  7.The aforementioned data displayed for the user and his/her “friends”with similar devices and/or tracking methods  8. Social content such asTwitter feeds, instant messaging, and/or Facebook updates  9. Otheronline content such as newspaper articles, horoscopes, weather reports,RSS feeds, comics, crossword puzzles, classified advertisements, stockreports, and websites 10. Email messages and calendar schedules

Content may be delivered to the biometric monitoring device according todifferent contexts. For instance, in the morning, news and weatherreports may be displayed along with the user's sleep data from theprevious night. In the evening, a daily summary of the day's activitiesmay be displayed.

The invention may also include NFC, RFID, or other short-range wirelesscommunication circuitry that may be used to initiate functionality inother devices. For instance, the invention may be equipped with an NFCantenna so that when a user puts it into close proximity with a mobilephone, an app is launched automatically on the mobile phone.

These examples are provided for illustration and are not intended tolimit the scope of data that may be transmitted, received, or displayedby the device, nor any intermediate processing that may occur duringsuch transfer and display. In view of this disclosure/application, manyother data can be envisioned by one reasonably skilled in the art.

Charging and Data Transmission

The biometric monitoring device may use a wired connection to charge aninternal rechargeable battery and/or transfer data to a host device suchas a laptop or mobile phone. In one embodiment, the device may usemagnets to help the user align the device to the dock or cable. Themagnetic field of magnets in the dock or cable and the magnets in thedevice itself could be strategically oriented to as to force the deviceto self align and provide a force that holds the device to the dock orcable. The magnets may also be used as conductive contacts for chargingor data transmission. In another embodiment, a permanent magnet is onlyused in the dock or cable side, not in the device itself. This mayimprove the performance of the biometric monitoring device where thedevice employs a magnetometer. With a magnet in the device, the strongfield of a nearby permanent magnet may increase the difficulty for themagnetometer to accurately measure the earth's magnetic field.

In another embodiment, the device could contain one or moreelectromagnets in the device body. The charger or dock for charging anddata transmission would also contain an electromagnet and/or a permanentmagnet. The device could only turn on its electromagnet when it is closeto the charger or dock. It could detect proximity to the dock by lookingfor the magnetic field signature of a permanent magnet in the charger ordock using a magnetometer. Alternatively it could detect proximity tothe charger by measuring the Received Signal Strength Indication or RSSIof a wireless signal from the charger or dock. The electromagnet couldbe reversed, creating a force that repels the device from the chargingcable or dock either when the device doesn't need to be charged, synced,or when it has completed syncing or charging.

Configurable App Functionality

In some embodiments, the biometric monitoring device of the presentinvention may include a watch-like form factor and/or bracelet, armlet,or anklet form factor and may be programmed with “apps” that launchspecific functionality and/or display specific information. Apps may belaunched or closed by a variety of means including but not limited topressing a button, using a capacitive touch sensor, performing a gesturethat is detected by an accelerometer, moving to a location detected by aGPS or motion sensor, compressing the device body, thereby creating apressure signal inside the device that is detected by an altimeter, orplacing the device close to an NFC tag which is associated with an appor set of apps. Apps may also be automatically triggered to launch orclose by certain environmental or physiological conditions including butnot limited to a high heart rate, the detection of water using a wetsensor (to launch a swimming application for example), a certain time ofday (to launch a sleep tracking application at night for example), achange in pressure and motion characteristic of a plane taking off orlanding to launch and close an “airplane” mode app. Apps may also belaunched or closed by meeting multiple conditions simultaneously. Forexample, if an accelerometer detects that a user is running and the userpresses a button it may launch a pedometer application, an altimeterdata collection application and/or display. In another case where theaccelerometer detects swimming and the user presses the same button, itmay launch a lap counting application.

In one embodiment, the device could have a swim-tracking mode that maybe launched by starting a swimming app. In this mode, the device'smotion sensors and/or magnetometer may be used to detect swim strokes,classify swim stroke types, detect swimming laps, and other relatedmetrics such as stroke efficiency, lap time, speed, distance, andcalorie burn. Directional changes indicated by the magnetometer may beused to detect a diversity of lap turn methods. In a preferredembodiment, data from a motion sensor and/or pressure sensor may be usedto detect strokes.

In another embodiment, a bicycling app may be launched by moving thedevice within proximity of an NFC or RFID tag that is located on thebicycle, on a mount on the bicycle or in a location associated with abicycle including but not limited to a bike rack or bike storagefacility. (See, for example, FIG. 16). The app launched may use adifferent algorithm than is normally used to determine metrics includingbut not limited to calories burned, distance travelled, and elevationgained. The app may also be launched when a wireless bike sensor isdetected including but not limited to a wheel sensor, GPS, cadencesensor, or power meter. The device may then display and/or record datafrom the wireless bike sensor or bike sensors.

Additional apps include but are not limited to a programmable orcustomizable watch face, stop watch, music player controller (e.g., mp3player remote control), text message and/or email display or notifier,navigational compass, bicycle computer display (when communicating witha separate or integrated GPS device, wheel sensor, or power meter),weight lifting tracker, sit-up reps tracker, pull up reps tracker,resistance training form/workout tracker, golf swing analyzer, tennis(or other racquet sport) swing/serve analyzer, tennis game swingdetector, baseball swing analyzer, ball throw analyzer (e.g., football,baseball), organized sports activity intensity tracker (e.g., football,baseball, basketball, volleyball, soccer), disk throw analyzer, foodbite detector, typing analyzer, tilt sensor, sleep quality tracker,alarm clock, stress meter, stress/relaxation biofeedback game (e.g.,potentially in combination with a mobile phone that provides auditoryand/or visual cues to train user breathing in relaxation exercises),teeth brushing tracker, eating rate tracker (e.g., to count or track therate and duration by which a utensil is brought to the mouth for foodintake), intoxication or suitability to drive a motor vehicle indicator(e.g., through heart rate, heart rate variability, galvanic skinresponse, gait analysis, puzzle solving, and the like), allergy tracker(e.g., using galvanic skin response, heart rate, skin temperature,pollen sensing and the like, possibly in combination with externalseasonal allergen tracking from, for instance, the internet; possiblydetermining the user's response to particular forms of allergen (e.g.,tree pollen) and alerting the user to the presence of such allergens(e.g., from seasonal information, pollen tracking databases, or localenvironmental sensors in the device or employed by the user)), fevertracker (e.g., measuring the risk, onset, or progress of a fever, cold,or other illness, possibly in combination with seasonal data, diseasedatabases, user location, and/or user provided feedback to assess thespread of a particular disease (e.g., flu) in relation to a user, andpossibly prescribing or suggesting the abstinence of work or activity inresponse), electronic games, caffeine affect tracker (e.g., monitoringthe physiologic response such as heart rate, heart rate variability,galvanic skin response, skin temperature, blood pressure, stress, sleep,and/or activity in either short term or long term response to the intakeor abstinence of coffee, tea, energy drinks and/or other caffeinatedbeverages), drug affect tracker (e.g., similar to the previouslymentioned caffeine tracker but in relation to other interventions,whether they be medical or lifestyle drugs such as alcohol, tobacco,etc.), endurance sport coach (e.g., recommending or prescribing theintensity, duration, or profile of a running/bicycling/swimming workout,or suggesting the abstinence or delay of a workout, in accordance with auser specified goal such as a marathon, triathlon, or custom goalutilizing data from, for instance, historical exercise activity (e.g.,distance run, pace), heart rate, heart rate variability,health/sickness/stress/fever state), weight and/or body composition,blood pressure, blood glucose, food intake or caloric balance tracker(e.g., notifying the user how many calories he may consume to maintainor achieve a weight), pedometer, and nail biting detector. In somecases, the apps may rely solely on the processing power and sensors ofthe invention. In other cases, the apps may fuse or merely displayinformation from an external device or set of external devices includingbut not limited to a heart rate strap, GPS distance tracker, bodycomposition scale, blood pressure monitor, blood glucose monitor, watch,smart watch, mobile communication device such as a smart phone ortablet, or server.

In one embodiment, the device may control a music player on a secondarydevice. Aspects of the music player that may be controlled include butare not limited to the volume, selection of tracks and/or playlists,skipping forward or backward, fast forwarding or rewinding of tracks,the tempo of the track, and the music player equalizer. Control of themusic player may be via user input or automatic based on physiological,environmental, or contextual data. For example, a user may be able toselect and play a track on their smart phone by selecting the trackthrough a user interface on the device. In another example, the devicemay automatically choose an appropriate track based on the activitylevel of the user (the activity level being calculated from devicesensor data). This may be used to help motivate a user to maintain acertain activity level. For example, if a user goes on a run and wantsto keep their heart rate in a certain range, the device may play anupbeat or higher tempo track if their heart rate is below the rangewhich they are aiming for.

There are many inventions described and illustrated herein. Whilecertain embodiments, features, attributes and advantages of theinventions have been described and illustrated, it should be understoodthat many others, as well as different and/or similar embodiments,features, attributes and advantages of the present inventions, areapparent from the description and illustrations. As such, the aboveembodiments of the inventions are merely exemplary. They are notintended to be exhaustive or to limit the inventions to the preciseforms, techniques, materials and/or configurations disclosed. Manymodifications and variations are possible in light of this disclosure.It is to be understood that other embodiments may be utilized andoperational changes may be made without departing from the scope of thepresent inventions. As such, the scope of the inventions is not limitedsolely to the description above because the description of the aboveembodiments has been presented for the purposes of illustration anddescription.

Importantly, the present invention is neither limited to any singleaspect nor embodiment, nor to any combinations and/or permutations ofsuch aspects and/or embodiments. Moreover, each of the aspects of thepresent invention, and/or embodiments thereof, may be employed alone orin combination with one or more of the other aspects and/or embodimentsthereof. For the sake of brevity, many of those permutations andcombinations will not be discussed and/or illustrated separately herein.

Accordingly, the present embodiments are to be considered asillustrative and not restrictive, and the various embodiments describedin the present disclosure are not to be limited to the details givenherein, but may be modified within the scope and equivalents of theappended claims.

What is claimed is:
 1. An activity monitoring device, comprising, ahousing configured for attachment to a body part of a user; a displayscreen attached to the housing; a first sensor disposed in the housingfor generating motion data based on motion of the activity monitoringdevice when attached to the body part of the user; a second sensordisposed in the housing for generating heart rate data based on samplinga heart rate of the user; memory disposed in the housing for storing themotion data generated by the first sensor and the heart rate datagenerated by the second sensor; and a processor disposed in the housingand configured to: determine that the motion data generated during aperiod of time indicates that the user is in an active state associatedwith an amount of user motion exceeding a threshold; in response to thedetermination that the motion data indicates that the user is in theactive state, cause the second sensor to generate the heart rate databased on sampling the heart rate of the user at a first sampling ratesufficient to reduce motion artifact caused by the user motion in theheart rate data; while the motion data indicates that the user is in theactive state, continue to cause the second sensor to generate the heartrate data based on sampling the heart rate of the user at the firstsampling rate; while the heart rate data is being generated based onsampling the heart rate of the user at the first sampling rate,determine that the motion data indicates that the user is in an inactivestate associated with an amount of user motion not exceeding thethreshold; in response to the determination that the motion dataindicates that the user is in the inactive state, cause the secondsensor to generate the heart rate data based on sampling the heart rateof the user at a second sampling rate that is lower than the firstsampling rate; and while the motion data indicates that the user is inthe inactive state, continue to cause the second sensor to generate theheart rate data based on sampling the heart rate of the user at thesecond sampling rate.
 2. The activity monitoring device of claim 1,wherein the second sensor is a photoplethysmography (PPG) sensorconfigured to capture light reflected from skin of the body part, thecaptured light used to sample the heart rate of the user.
 3. Theactivity monitoring device of claim 1, wherein the processor is furtherconfigured to cause the activity monitoring device to enter a reducedpower consumption state, in response to the determination that themotion data indicates that the user is in the inactive state.
 4. Theactivity monitoring device of claim 1, wherein the processor is furtherconfigured to cause the activity monitoring device to enter a higherpower consumption state, in response to the determination that themotion data indicates that the user is in the active state.
 5. Theactivity monitoring device of claim 1, wherein the processor is furtherconfigured to control an amount of data processing performed by theactivity monitoring device to thereby reduce power consumed by theactivity monitoring device while the motion data indicates that the useris in the inactive state.
 6. The activity monitoring device of claim 1,wherein the processor is further configured to calculate a heart ratevariability metric based on measurements from the second sensor based ona third sampling rate greater than the first sampling rate while themotion data indicates that the user is in the inactive state.
 7. Theactivity monitoring device of claim 1, wherein the processor is furtherconfigured to measure the heart rate of the user via analog signalconditioning circuitry of the activity monitoring device based on thesecond sampling rate lower than the first sampling rate to therebyreduce power consumed by the activity monitoring device while the motiondata indicates that the user is in the inactive state.
 8. The activitymonitoring device of claim 1, wherein the processor is furtherconfigured to, in response to detecting a user command to generate theheart rate data based on sampling the heart rate of the user at a higherrate, increase the rate at which the heart rate of the user is sampled.9. The activity monitoring device of claim 8, wherein the user commandis detected via a button provided on the activity monitoring device. 10.The activity monitoring device of claim 1, wherein the thresholdcomprises a threshold acceleration, the processor further configured todetermine whether an acceleration of the user indicated by the motiondata exceeds the threshold acceleration.
 11. The activity monitoringdevice of claim 1, wherein the threshold amount is a threshold speed,the processor further configured to determine whether a speed of theuser indicated by the motion data exceeds the threshold speed.
 12. Amethod of operating an activity monitoring device, the activitymonitoring device having a housing configured for attachment to a bodypart of a user and a display screen attached to the housing, the methodcomprising: generating, using a first sensor disposed in the housing,motion data based on motion of the activity monitoring device when theactivity monitoring device is attached to the body part of the user;generating, using a second sensor disposed in the housing, heart ratedata based on sampling a heart rate of the user; storing the motion datagenerated by the first sensor and the heart rate data generated by thesecond sensor to a memory of the activity monitoring device; determiningthat the motion data generated during a period of time indicates thatthe user is in an active state associated with an amount of user motionexceeding a threshold; in response to determining that the motion dataindicates that the user is in the active state, causing the secondsensor to generate the heart rate data based on sampling the heart rateof the user at a first sampling rate sufficient to reduce motionartifact caused by the user motion in the heart rate data; while themotion data indicates that the user is in the active state, continuingto cause the second sensor to generate the heart rate data based onsampling the heart rate of the user at the first sampling rate; whilethe heart rate data is being generated based on sampling the heart rateof the user at the first sampling rate, determining that the motion dataindicates that the user is in an inactive state associated with anamount of user motion not exceeding the threshold; in response todetermining that the motion data indicates that the user is in theinactive state, causing the second sensor to generate the heart ratedata based on sampling the heart rate of the user at a second samplingrate that is lower than the first sampling rate; and while the motiondata indicates that the user is in the inactive state, continuing tocause the second sensor to generate the heart rate data based onsampling the heart rate of the user at the second sampling rate.
 13. Themethod of claim 12, wherein the second sensor is a photoplethysmography(PPG) sensor, the second sensor being used for capturing light reflectedfrom skin of the body part, the captured light used to sample the heartrate of the user.
 14. The method of claim 12, further comprising,causing the activity monitoring device to enter a reduced powerconsumption state, in response to the determination that the motion dataindicates that the user is in the inactive state.
 15. The method ofclaim 12, further comprising, causing the activity monitoring device toenter a higher power consumption state, in response to the determinationthat the motion data indicates that the user is in the active state. 16.The method of claim 12, further comprising, controlling an amount ofdata processing performed by the activity monitoring device to therebyreduce power consumed by the activity monitoring device while the motiondata indicates that the user is in the inactive state.
 17. The method ofclaim 12, further comprising, calculating a heart rate variabilitymetric based on measurements from the second sensor based on a thirdsampling rate greater than the first sampling rate while the motion dataindicates that the user is in the inactive state.
 18. The method ofclaim 12, further comprising, measuring the heart rate of the user viaanalog signal conditioning circuitry of the activity monitoring devicebased on the second sampling rate lower than the first sampling rate tothereby reduce power consumed by the activity monitoring device whilethe motion data indicates that the user is in the inactive state. 19.Non-transitory physical computer storage having program instructions tobe executed by an activity monitoring device, the activity monitoringdevice having a housing configured for attachment to a body part of auser and a display screen attached to the housing, the programinstructions comprising: program instructions for generating, using afirst sensor disposed in the housing, motion data based on motion of theactivity monitoring device when the activity monitoring device isattached to the body part of the user; program instructions forgenerating, using a second sensor disposed in the housing, heart ratedata based on sampling a heart rate of the user; program instructionsfor storing the motion data generated by the first sensor and the heartrate data generated by the second sensor to a memory of the activitymonitoring device; program instructions for determining that the motiondata generated during a period of time indicates that the user is in anactive state associated with an amount of user motion exceeding athreshold; program instructions for causing, in response to determiningthat the motion data indicates that the user is in the active state, thesecond sensor to generate the heart rate data based on sampling theheart rate of the user at a first sampling rate sufficient to reducemotion artifact caused by the user motion in the heart rate data;program instructions for continuing to cause the second sensor togenerate the heart rate data based on sampling the heart rate of theuser at the first sampling rate while the motion data indicates that theuser is in the active state; program instructions for determining, whilethe heart rate data is being generated based on sampling the heart rateof the user at the first sampling rate, that the motion data indicatesthat the user is in an inactive state associated with an amount of usermotion not exceeding the threshold; program instructions for causing, inresponse to determining that the motion data indicates that the user isin the inactive state, the second sensor to generate the heart rate databased on sampling the heart rate of the user at a second sampling ratethat is lower than the first sampling rate; and program instructions forcontinuing to cause the second sensor to generate the heart rate databased on sampling the heart rate of the user at the second sampling ratewhile the motion data indicates that the user is in the inactive state.20. The non-transitory physical computer storage of claim 19, whereinthe second sensor is a photoplethysmography (PPG) sensor, the secondsensor being used for capturing light reflected from skin of the bodypart, the captured light used to sample the heart rate of the user. 21.The non-transitory physical computer storage of claim 19, furthercomprising, program instructions for causing the activity monitoringdevice to enter a reduced power consumption state, in response to thedetermination that the motion data indicates that the user is in theinactive state.
 22. The non-transitory physical computer storage ofclaim 19, further comprising, program instructions for causing theactivity monitoring device to enter a higher power consumption state, inresponse to the determination that the motion data indicates that theuser is in the active state.
 23. The non-transitory physical computerstorage of claim 19, further comprising, program instructions forcontrolling an amount of data processing performed by the activitymonitoring device to thereby reduce power consumed by the activitymonitoring device while the motion data indicates that the user is inthe inactive state.
 24. The non-transitory physical computer storage ofclaim 19, further comprising, program instructions for calculating aheart rate variability metric based on measurements from the secondsensor based on a third sampling rate greater than the first samplingrate while the motion data indicates that the user is in the inactivestate.
 25. The non-transitory physical computer storage of claim 19,further comprising, program instructions for measuring the heart rate ofthe user via analog signal conditioning circuitry of the activitymonitoring device based on the second sampling rate lower than the firstsampling rate to thereby reduce power consumed by the activitymonitoring device while the motion data indicates that the user is inthe inactive state.